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Lighthouse Mobile

· 0 checks — Mobile Lighthouse audit -- Performance, Accessibility, Best Practices, and SEO category breakdown.
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Detailed Report

Audit breakdown by category with detailed findings.

25

Performance

Insights

Remove large, duplicate JavaScript modules from bundles to reduce unnecessary bytes consumed by network activity.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Polyfills and transforms enable older browsers to use new JavaScript features. However, many aren't necessary for modern browsers. Consider modifying your JavaScript build process to not transpile Baseline features, unless you know you must support older browsers. Learn why most sites can deploy ES6+ code without transpiling

Why this matters

Performance issues directly impact user engagement and conversion rates.

3rd party code can significantly impact load performance. Reduce and defer loading of 3rd party code to prioritize your page's content.

Why this matters

Performance issues directly impact user engagement and conversion rates.

A long cache lifetime can speed up repeat visits to your page. Learn more about caching.

Why this matters

Performance issues directly impact user engagement and conversion rates.

RequestCache TTLTransfer Size
connect.facebook.net/en_US/fbevents.js1200.0 s96.6 KiB
vpodv.harpercollins.com/eat/core0.0 ms48.7 KiB
ak.sail-horizon.com/spm/spm.v1.min.js600.0 s48.2 KiB
/signals/config/1115990331856782?v=2.9.303&r=stable&domai...1200.0 s48.1 KiB
na.shgcdn3.com/collector.js?shop=harpercollins-us.myshopify.com0.0 ms26.6 KiB
b-code.liadm.com/a-0172.min.js86400.0 s47.1 KiB
www.redditstatic.com/ads/pixel.js60.0 s19.0 KiB
/fss/flelv5/a0893b4f-eab4-4495-af29-968048b08b86/hcp-logo...0.0 ms18.5 KiB
js.adsrvr.org/up_loader.1.1.0.js0.0 ms12.3 KiB
cdn.auth0.com/js/auth0-spa-js/2.1/auth0-spa-js.production.js10800.0 s13.7 KiB
widgetic.com/sdk/sdk.js?shop=harpercollins-us.myshopify.com86400.0 s16.2 KiB
/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da177152312...86400.0 s10.7 KiB
/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da177152312...86400.0 s10.7 KiB
/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da177152312...86400.0 s10.6 KiB
/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da177152312...86400.0 s10.6 KiB
/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da177152312...86400.0 s10.6 KiB
cdn.attn.tv/hcp/dtag.js?shop=harpercollins-us.myshopify.com120.0 s3.7 KiB
vpodv.harpercollins.com/hcp/load300.0 s3.5 KiB
ct.pinterest.com/static/ct/token_create.js7200.0 s3.9 KiB
s.pinimg.com/ct/lib/main.10d2511a.js1209600.0 s27.3 KiB
script.crazyegg.com/pages/scripts/0064/3811.js300.0 s2.7 KiB
/a/elevar/static/configs/66b8d458c1fb8f192642404f8faece57...1.0 s2.3 KiB
/cdn/shopifycloud/portable-wallets/latest/accelerated-che...300.0 s2.1 KiB
/configs/66b8d458c1fb8f192642404f8faece57fa6207fc/config.js1.0 s2.0 KiB
s.pinimg.com/ct/core.js7200.0 s2.1 KiB
/st?ga_tracking_id=G-BWH2Y83W11&ga_client_id=911221457.17...0.0 ms1.3 KiB
/redirect-app.js?shop=harpercollins-us.myshopify.com0.0 ms1.2 KiB
/a/elevar/static/configs/66b8d458c1fb8f192642404f8faece57...1.0 s1.1 KiB
js.adsrvr.org/universal_pixel.js0.0 ms935 B
/rp.gif?ts=1776813402813&id=t2_ee3m052f&event=PageVisit&m...0.0 ms666 B
/cdn-cgi/scripts/5c5dd728/cloudflare-static/email-decode....2853.0 s724 B
/st?ga_tracking_id=G-BWH2Y83W11&ga_client_id=911221457.17...0.0 ms582 B
shop.app/checkouts/internal/preloads.js?locale=en-US&shop_id=2852821405060.0 s532 B
/config/com/31bf507c-91e5-4593-84d7-7aec67170ffa.js?v=3.5...0.0 ms476 B
cdn.attn.tv/growth-tag-assets/client-configs/NYV.js0.0 ms371 B
www.gstatic.com/recaptcha/api2/logo_48.png604800.0 s2.3 KiB
cdnjs.cloudflare.com/polyfill/v3/polyfill.min.js604800.0 s741 B
/v.gif?cd=0&a=975792&d=harpercollins.com&u=DB36514392EEB3...43200.0 s147 B
/tr/?id=1115990331856782&ev=PageView&dl=https%3A%2F%2Fwww...0.0 ms19 B
/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da177152312...86400.0 s0 B

Your first network request is the most important. Reduce its latency by avoiding redirects, ensuring a fast server response, and enabling text compression.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Consider setting font-display to swap or optional to ensure text is consistently visible. swap can be further optimized to mitigate layout shifts with font metric overrides.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLEst Savings
/cdn/shop/t/8/assets/algolia_dependency_fontawesome-webfo...65 ms
fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff210 ms

A forced reflow occurs when JavaScript queries geometric properties (such as offsetWidth) after styles have been invalidated by a change to the DOM state. This can result in poor performance. Learn more about forced reflows and possible mitigations.

Why this matters

Performance issues directly impact user engagement and conversion rates.

headings: [map[key:source label:Top function call valueType:source-location] map[granularity:1 key:reflowTime label:Total reflow time valueType:ms]]
items: [map[reflowTime:63.292 source:map[column:61608 line:12 type:source-location url:https://www.harpercollins.com/cdn/shop/t/8/assets/swiper.min.js?v=70355053751033516171589214879 urlProvider:network]]]
headings: [map[key:source label:Source valueType:source-location] map[granularity:1 key:reflowTime label:Total reflow time valueType:ms]]
items: [map[reflowTime:121.664 source:map[column:35004 line:0 type:source-location url:https://www.harpercollins.com/cdn/shopifycloud/perf-kit/shopify-perf-kit-3.3.1.min.js urlProvider:network]] map[reflowTime:57.191 source:map[column:121229 line:0 type:source-location url:https://www.harpercollins.com/cdn/wpm/b5153dfa3wa14e0a32p72aa89e7m94579b79m.js urlProvider:network]] map[reflowTime:54.361 source:map[column:37700 line:11 type:source-location url:https://www.harpercollins.com/cdn/shop/t/8/assets/swiper.min.js?v=70355053751033516171589214879 urlProvider:network]] map[reflowTime:25.7 source:map[column:6938 line:11 type:source-location url:https://www.harpercollins.com/cdn/shop/t/8/assets/swiper.min.js?v=70355053751033516171589214879 urlProvider:network]] map[reflowTime:31.431 source:map[column:22489 line:11 type:source-location url:https://www.harpercollins.com/cdn/shop/t/8/assets/swiper.min.js?v=70355053751033516171589214879 urlProvider:network]] map[reflowTime:97.711 source:map[type:text value:[unattributed]]] map[reflowTime:0.156 source:map[column:64357 line:1 type:source-location url:https://vpodv.harpercollins.com/eat/core urlProvider:network]] map[reflowTime:8.112 source:map[column:16959 line:11 type:source-location url:https://www.harpercollins.com/cdn/shop/t/8/assets/swiper.min.js?v=70355053751033516171589214879 urlProvider:network]] map[reflowTime:0.534 source:map[column:52839 line:11 type:source-location url:https://www.harpercollins.com/cdn/shop/t/8/assets/swiper.min.js?v=70355053751033516171589214879 urlProvider:network]] map[reflowTime:4.647 source:map[column:332 line:412 type:source-location url:https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js urlProvider:network]] map[reflowTime:0.775 source:map[column:4349 line:0 type:source-location url:https://www.harpercollins.com/a/elevar/static/getelevar/3.33.0/dl-app-embed-block.js urlProvider:network]]]

Reducing the download time of images can improve the perceived load time of the page and LCP. Learn more about optimizing image size

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLResource SizeEst Savings
Come Eat by Melissa Ben-Ishay (9780063451636) div.swiper-wrapper > div.swiper-slide > a.swiper-link > img.swiper-lazy
/cdn/shop/files/9780063451650_c3817265-b496-4468-b651-e46...179.0 KiB175.6 KiB
Shadow Strike by Brad Taylor (9780063433199) div.swiper-wrapper > div.swiper-slide > a.swiper-link > img.swiper-lazy
/cdn/shop/files/9780063433229_82e95ebe-5668-44e5-a99d-5f9...140.6 KiB136.4 KiB
Remarkably Bright Creatures [Movie Tie-in] by Shelby Van Pelt (9780063512955) div.swiper-wrapper > div.swiper-slide > a.swiper-link > img.swiper-lazy
www.harpercollins.com/cdn/shop/files/9780063512955_540x.jpg?v=1775768828110.8 KiB106.5 KiB
Divergent Deluxe Limited Edition by Veronica Roth, Nicolas Delort (978006348212… div.swiper-wrapper > div.swiper-slide > a.swiper-link > img.swiper-lazy
www.harpercollins.com/cdn/shop/files/9780063482128_540x.jpg?v=177443527097.5 KiB93.2 KiB
Reborn by Jaymin Eve (9780778306047) div.swiper-wrapper > div.swiper-slide > a.swiper-link > img.swiper-lazy
www.harpercollins.com/cdn/shop/files/9780778306047_540x.jpg?v=177656543695.1 KiB91.2 KiB
The Rough Side of the Mountain by Keisha Lance Bottoms (9780063420083) div.swiper-wrapper > div.swiper-slide > a.swiper-link > img.swiper-lazy
/cdn/shop/files/9780063420106_80915f20-55c1-44a5-a4a2-722...89.5 KiB85.3 KiB
BillboardOverlay ReleaseMe a.fourByTwo > div.swiper-lazy > div.image-container > img.swiper-lazy
/cdn/shop/files/BillboardOverlay-ReleaseMe_780x.png?v=177...92.3 KiB82.8 KiB
New_in_Historical_Fiction_2026_TileAd div.swiper-wrapper > div.swiper-slide > a > img.visitOurImg
/cdn/shop/files/New_in_Historical_Fiction_2026_TileAd_600...89.5 KiB77.3 KiB
HCP Homepage TileAd Grad div.swiper-wrapper > div.swiper-slide > a > img.visitOurImg
/cdn/shop/files/HCP-Homepage-TileAd-Grad_600x.png?v=17767...70.6 KiB58.5 KiB
TileAd_WinniePooh div.swiper-wrapper > div.swiper-slide > a > img.visitOurImg
www.harpercollins.com/cdn/shop/files/TileAd_WinniePooh_600x.png?v=172963108162.0 KiB49.8 KiB
BillboardOverlay2CherryBaby a.fourByTwo > div.swiper-lazy > div.image-container > img.swiper-lazy
/cdn/shop/files/BillboardOverlay2_CherryBaby_780x.png?v=1...58.1 KiB49.6 KiB
BillboardOverlayStarside a.fourByTwo > div.swiper-lazy > div.image-container > img.swiper-lazy
/cdn/shop/files/BillboardOverlay_Starside_780x.png?v=1774...54.2 KiB44.7 KiB
BillboardOverlayTEWI a.fourByTwo > div.swiper-lazy > div.image-container > img.swiper-lazy
www.harpercollins.com/cdn/shop/files/BillboardOverlay_TEWI_780x.png?v=177558191247.1 KiB38.6 KiB
HCcomTileAd_NomadEditions V2b div.swiper-wrapper > div.swiper-slide > a > img.visitOurImg
/cdn/shop/files/HCcomTileAd_NomadEditions-V2b_600x.png?v=...42.6 KiB31.0 KiB
Overlay800x34050b4e62b 8dbc 49b1 babd 2bc606de06bf a.fourByTwo > div.swiper-lazy > div.image-container > img.swiper-lazy
/cdn/shop/files/Overlay_800x340_50b4e62b-8dbc-49b1-babd-2...33.0 KiB25.5 KiB
TileAd_Kids100 div.swiper-wrapper > div.swiper-slide > a > img.visitOurImg
www.harpercollins.com/cdn/shop/files/TileAd_Kids100_600x.png?v=177506331726.4 KiB19.2 KiB
New in Memoir & Biography div.row > div.col-md-4 > a.spotlight-block > img
/cdn/shop/files/HCP-Homepage-Spotlight-memoirs3_600x.png?...32.3 KiB19.2 KiB
div > div > div.sailthru_0_0_0 > img div > div > div.sailthru_0_0_0 > img
/fss/flelv5/a0893b4f-eab4-4495-af29-968048b08b86/hcp-logo...18.0 KiB17.0 KiB
Find the Perfect Gift div.row > div.col-md-4 > a.spotlight-block > img
/cdn/shop/files/HCP-Homepage-Spotlight-MothersDay-Final_6...23.4 KiB13.9 KiB
Tile3_Spotify div.swiper-wrapper > div.swiper-slide > a > img.visitOurImg
www.harpercollins.com/cdn/shop/files/Tile3_Spotify_600x.png?v=173039725618.2 KiB13.3 KiB

Optimize LCP by making the LCP image discoverable from the HTML immediately, and avoiding lazy-loading

Why this matters

Performance issues directly impact user engagement and conversion rates.

lhId: page-20-DIV
nodeLabel: Shop Now
path: 1,HTML,1,BODY,26,MAIN,1,DIV,0,SECTION,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,1,DIV,0,A,0,DIV
selector: div.swiper-wrapper > div.swiper-slide > a.fourByTwo > div.swiper-lazy
snippet: <div class="swiper-lazy grid-item swiper-lazy-loaded" style="background-image: url(&quot;//www.harpercollins.com/cdn/shop/files/BillboardBac…&quot;);">

Avoid chaining critical requests by reducing the length of chains, reducing the download size of resources, or deferring the download of unnecessary resources to improve page load.

Why this matters

Performance issues directly impact user engagement and conversion rates.

More than 4 preconnect connections were found. These should be used sparingly and only to the most important origins.
description: [preconnect](https://developer.chrome.com/docs/lighthouse/performance/uses-rel-preconnect/) hints help the browser establish a connection earlier in the page load, saving time when the first request for that origin is made. The following are the origins that the page preconnected to.
title: Preconnected origins
description: Add [preconnect](https://developer.chrome.com/docs/lighthouse/performance/uses-rel-preconnect/) hints to your most important origins, but try to use no more than 4.
title: Preconnect candidates

Requests are blocking the page's initial render, which may delay LCP. Deferring or inlining can move these network requests out of the critical path.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLTransfer SizeDuration
/css2?family=Poppins:ital,wght@0,100;0,200;0,300;0,400;0,...1.3 KiB164 ms
/cdn/shop/t/8/assets/vue.min.js?v=17382022256029746221158...32.6 KiB766 ms
/cdn/shop/t/8/assets/bootstrap.min.css?v=5927244447714181...20.2 KiB766 ms
/cdn/shop/t/8/assets/cart-drawer.css?v=842942093884082011...2.4 KiB153 ms
/cdn/shopifycloud/portable-wallets/latest/accelerated-che...2.1 KiB
/cdn/shop/t/8/assets/theme-critical.css?v=103820723354404...5.6 KiB153 ms

These insights are also available in the Chrome DevTools Performance Panel - record a trace to view more detailed information.

Time to Interactive is the amount of time it takes for the page to become fully interactive. Learn more about the Time to Interactive metric.

Why this matters

Performance issues directly impact user engagement and conversion rates.

TTI

Redirects introduce additional delays before the page can be loaded. Learn how to avoid page redirects.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 885 ms
URLTime Spent
harpercollins.com/885 ms
www.harpercollins.com/0.0 ms

The maximum potential First Input Delay that your users could experience is the duration of the longest task. Learn more about the Maximum Potential First Input Delay metric.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Diagnostics

Reduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. Learn how to reduce unused CSS.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 410 ms 50.0 KiB
URLTransfer SizeEst Savings
cdn.jsdelivr.net/npm/bootstrap@5.3.7/dist/css/bootstrap.min.css32.4 KiB31.3 KiB
/cdn/shop/t/8/assets/bootstrap.min.css?v=5927244447714181...19.6 KiB18.7 KiB

Reduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. Learn how to reduce unused JavaScript.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 2.4 s 687.8 KiB
URLTransfer SizeEst Savings
www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js361.8 KiB176.9 KiB
www.googletagmanager.com/gtag/destination?id=AW-16769633610&cx=c&gtm=4e64h1143.5 KiB60.8 KiB
www.googletagmanager.com/gtag/js?id=DC-15547771&cx=c&gtm=4e64h1129.3 KiB60.5 KiB
www.googletagmanager.com/gtm.js?id=GTM-5J46CG3180.1 KiB59.6 KiB
www.googletagmanager.com/gtag/js?id=G-BWH2Y83W11&cx=c&gtm=4e64h1151.0 KiB59.6 KiB
/cdn/shop/t/8/assets/algolia_externals.js?v=1314249531217...80.6 KiB59.0 KiB
analytics.tiktok.com/i18n/pixel/static/main.MWE0ZWQ3ZWQwMg.js89.6 KiB47.8 KiB
connect.facebook.net/en_US/fbevents.js96.5 KiB32.8 KiB
ak.sail-horizon.com/spm/spm.v1.min.js47.7 KiB29.6 KiB
/pages/versioned/common-scripts/4ce8c7df8d425cc5046457682...55.1 KiB28.7 KiB
vpodv.harpercollins.com/eat/core48.7 KiB27.3 KiB
www.harpercollins.com/cdn/wpm/b5153dfa3wa14e0a32p72aa89e7m94579b79m.js59.9 KiB24.9 KiB
b-code.liadm.com/a-0172.min.js46.8 KiB20.3 KiB

Consider reducing the time spent parsing, compiling, and executing JS. You may find delivering smaller JS payloads helps with this. Learn how to reduce Javascript execution time.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLTotal CPU TimeScript EvaluationScript Parse
Unattributable5.6 s1.0 s0.0 ms
www.harpercollins.com/3.8 s733 ms49 ms
www.redditstatic.com/ads/pixel.js1.4 s1.2 s7.1 ms
www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js1.3 s1.1 s94 ms
/cdn/shop/t/8/assets/swiper.min.js?v=70355053751033516171...1.0 s238 ms12 ms
/spx?dxver=4.0.0&shaid=32683&tdr=&plh=https%3A%2F%2Fwww.h...952 ms874 ms3.1 ms
www.googletagmanager.com/gtm.js?id=GTM-5J46CG3823 ms682 ms68 ms
www.harpercollins.com/cdn/wpm/b5153dfa3wa14e0a32p72aa89e7m94579b79m.js774 ms444 ms19 ms
www.harpercollins.com/cdn/shopifycloud/perf-kit/shopify-perf-kit-3.3.1.min.js634 ms141 ms6.9 ms
/pages/versioned/tracking-scripts/158692313dc4b9f2e28d9e9...626 ms576 ms7.0 ms
www.googletagmanager.com/gtag/js?id=G-BWH2Y83W11&cx=c&gtm=4e64h1489 ms435 ms46 ms
www.googletagmanager.com/gtag/destination?id=AW-16769633610&cx=c&gtm=4e64h1485 ms415 ms66 ms
vpodv.harpercollins.com/eat/core412 ms311 ms59 ms
/pages/versioned/common-scripts/4ce8c7df8d425cc5046457682...355 ms298 ms16 ms
na.shgcdn3.com/collector.js?shop=harpercollins-us.myshopify.com313 ms277 ms18 ms
/cdn/s/trekkie.storefront.853740ed6e9bdebbd97573c5bbdd9cf...300 ms233 ms30 ms
sc-static.net/scevent.min.js295 ms257 ms6.3 ms
analytics.tiktok.com/i18n/pixel/static/main.MWE0ZWQ3ZWQwMg.js292 ms243 ms45 ms
connect.facebook.net/en_US/fbevents.js238 ms199 ms37 ms
b-code.liadm.com/a-0172.min.js223 ms186 ms13 ms
/signals/config/1115990331856782?v=2.9.303&r=stable&domai...217 ms190 ms25 ms
www.googletagmanager.com/gtag/js?id=DC-15547771&cx=c&gtm=4e64h1210 ms174 ms34 ms
www.harpercollins.com/a/elevar/static/getelevar/3.33.0/dl-app-embed-block.js196 ms163 ms0.5 ms
widgetic.com/sdk/sdk.js?shop=harpercollins-us.myshopify.com190 ms177 ms12 ms
/cdn/shop/t/8/assets/algolia_externals.js?v=1314249531217...167 ms131 ms36 ms
/cdn/shopifycloud/storefront/assets/storefront/load_featu...165 ms162 ms1.7 ms
js.adsrvr.org/up_loader.1.1.0.js154 ms120 ms3.9 ms
/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da177152312...130 ms74 ms11 ms
ak.sail-horizon.com/spm/spm.v1.min.js128 ms107 ms15 ms
s.pinimg.com/ct/lib/main.10d2511a.js125 ms113 ms10 ms
link.harpercollins.com/join/signup-hc123 ms2.9 ms3.2 ms
/cdn/shop/t/8/assets/algolia_autocomplete.js?v=1810923446...102 ms87 ms0.8 ms
/instafeed-73bc11875a20f48781d7dd3b41929a65.js?shop=harpe...99 ms67 ms11 ms
/cdn/shop/t/8/assets/jquery-3.4.1.min.js?v=67022563737761...91 ms64 ms8.8 ms
gs.mountain.com/gs80 ms15 ms0.3 ms
script.crazyegg.com/pages/scripts/0064/3811.js80 ms60 ms0.9 ms
/cdn/shopifycloud/shop-js/modules/v2/chunk.useEventListen...73 ms68 ms0.1 ms
/cdn/shopifycloud/shop-js/modules/v2/chunk.hooks_CA-R9f6I...72 ms51 ms0.4 ms
/st?ga_tracking_id=G-BWH2Y83W11&ga_client_id=911221457.17...71 ms17 ms0.9 ms
/cdn/shopifycloud/storefront/assets/shopify_pay/storefron...69 ms60 ms7.5 ms
/cdn/shop/t/8/assets/vue.min.js?v=17382022256029746221158...67 ms18 ms18 ms
ct.pinterest.com/static/ct/token_create.js60 ms56 ms2.5 ms
analytics.tiktok.com/i18n/pixel/static/identify_5cff1caf.js59 ms41 ms17 ms
cdn.attn.tv/growth-tag-assets/client-configs/NYV.js57 ms56 ms0.5 ms
bat.bing.com/bat.js56 ms46 ms9.2 ms
shopify-webhooks.sailthru.com/shopify.js?shop=harpercollins-us.myshopify.com55 ms52 ms2.6 ms

Consider reducing the time spent parsing, compiling and executing JS. You may find delivering smaller JS payloads helps with this. Learn how to minimize main-thread work

Why this matters

Performance issues directly impact user engagement and conversion rates.

CategoryTime Spent
Script Evaluation12.5 s
Other6.1 s
Style & Layout3.3 s
Script Parsing & Compilation903 ms
Rendering674 ms
Parse HTML & CSS285 ms
Garbage Collection239 ms

Minifying JavaScript files can reduce payload sizes and script parse time. Learn how to minify JavaScript.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 0.0 ms 13.1 KiB
URLTransfer SizeEst Savings
shopify-webhooks.sailthru.com/shopify.js?shop=harpercollins-us.myshopify.com24.2 KiB10.4 KiB
inline: function st_runDataValidation(form) { …4.0 KiB2.6 KiB

Large network payloads cost users real money and are highly correlated with long load times. Learn how to reduce payload sizes.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLTransfer Size
www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js362.4 KiB
www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js362.3 KiB
/cdn/shopifycloud/checkout-web/assets/c1/shop-pay-useHasO...329.5 KiB
www.googletagmanager.com/gtm.js?id=GTM-5J46CG3180.5 KiB
/cdn/shop/files/9780063451650_c3817265-b496-4468-b651-e46...179.7 KiB
www.googletagmanager.com/gtag/js?id=G-BWH2Y83W11&cx=c&gtm=4e64h1151.1 KiB
www.googletagmanager.com/gtag/destination?id=AW-16769633610&cx=c&gtm=4e64h1143.6 KiB
/cdn/shop/files/9780063433229_82e95ebe-5668-44e5-a99d-5f9...141.4 KiB
www.googletagmanager.com/gtag/js?id=DC-15547771&cx=c&gtm=4e64h1129.4 KiB
www.harpercollins.com/cdn/shop/files/9780063512955_540x.jpg?v=1775768828111.5 KiB

Set an explicit width and height on image elements to reduce layout shifts and improve CLS. Learn how to set image dimensions

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL
BillboardOverlayStarside a.fourByTwo > div.swiper-lazy > div.image-container > img.swiper-lazy
/cdn/shop/files/BillboardOverlay_Starside_780x.png?v=1774...
Overlay800x34050b4e62b 8dbc 49b1 babd 2bc606de06bf a.fourByTwo > div.swiper-lazy > div.image-container > img.swiper-lazy
/cdn/shop/files/Overlay_800x340_50b4e62b-8dbc-49b1-babd-2...
BillboardOverlayStarside a.fourByTwo > div.swiper-lazy > div.image-container > img.swiper-lazy
/cdn/shop/files/BillboardOverlay_Starside_780x.png?v=1774...
BillboardOverlay ReleaseMe a.fourByTwo > div.swiper-lazy > div.image-container > img.swiper-lazy
/cdn/shop/files/BillboardOverlay-ReleaseMe_780x.png?v=177...
BillboardOverlay2CherryBaby a.fourByTwo > div.swiper-lazy > div.image-container > img.swiper-lazy
/cdn/shop/files/BillboardOverlay2_CherryBaby_780x.png?v=1...
BillboardOverlayTEWI a.fourByTwo > div.swiper-lazy > div.image-container > img.swiper-lazy
www.harpercollins.com/cdn/shop/files/BillboardOverlay_TEWI_780x.png?v=1775581912
BillboardOverlay2SOE a.fourByTwo > div.swiper-lazy > div.image-container > img.swiper-lazy
www.harpercollins.com/cdn/shop/files/BillboardOverlay2_SOE_780x.png?v=1775072619
BillboardOverlay2CherryBaby a.fourByTwo > div.swiper-lazy > div.image-container > img.swiper-lazy
/cdn/shop/files/BillboardOverlay2_CherryBaby_780x.png?v=1...
New in Memoir & Biography div.row > div.col-md-4 > a.spotlight-block > img
/cdn/shop/files/HCP-Homepage-Spotlight-memoirs3_600x.png?...
Lines Worth Returning To div.row > div.col-md-4 > a.spotlight-block > img
/cdn/shop/files/Spotlight-Image_NPM2026_600x.png?v=177558...
Find the Perfect Gift div.row > div.col-md-4 > a.spotlight-block > img
/cdn/shop/files/HCP-Homepage-Spotlight-MothersDay-Final_6...
div > div > div.sailthru_0_0_0 > img div > div > div.sailthru_0_0_0 > img
/fss/flelv5/a0893b4f-eab4-4495-af29-968048b08b86/hcp-logo...
Tile3_Spotify div.swiper-wrapper > div.swiper-slide > a > img.visitOurImg
www.harpercollins.com/cdn/shop/files/Tile3_Spotify_600x.png?v=1730397256
HCP Homepage TileAd Grad div.swiper-wrapper > div.swiper-slide > a > img.visitOurImg
/cdn/shop/files/HCP-Homepage-TileAd-Grad_600x.png?v=17767...
HCcomTileAd_NomadEditions V2b div.swiper-wrapper > div.swiper-slide > a > img.visitOurImg
/cdn/shop/files/HCcomTileAd_NomadEditions-V2b_600x.png?v=...
Tile3_Spotify div.swiper-wrapper > div.swiper-slide > a > img.visitOurImg
www.harpercollins.com/cdn/shop/files/Tile3_Spotify_600x.png?v=1730397256
HCP Homepage TileAd Grad div.swiper-wrapper > div.swiper-slide > a > img.visitOurImg
/cdn/shop/files/HCP-Homepage-TileAd-Grad_600x.png?v=17767...
TileAd_WinniePooh div.swiper-wrapper > div.swiper-slide > a > img.visitOurImg
www.harpercollins.com/cdn/shop/files/TileAd_WinniePooh_600x.png?v=1729631081
New_in_Historical_Fiction_2026_TileAd div.swiper-wrapper > div.swiper-slide > a > img.visitOurImg
/cdn/shop/files/New_in_Historical_Fiction_2026_TileAd_600...
TileAd_Kids100 div.swiper-wrapper > div.swiper-slide > a > img.visitOurImg
www.harpercollins.com/cdn/shop/files/TileAd_Kids100_600x.png?v=1775063317
TileAd_WinniePooh div.swiper-wrapper > div.swiper-slide > a > img.visitOurImg
www.harpercollins.com/cdn/shop/files/TileAd_WinniePooh_600x.png?v=1729631081
New_in_Historical_Fiction_2026_TileAd div.swiper-wrapper > div.swiper-slide > a > img.visitOurImg
/cdn/shop/files/New_in_Historical_Fiction_2026_TileAd_600...
Divergent Deluxe Limited Edition by Veronica Roth, Nicolas Delort (978006348212… div.swiper-wrapper > div.swiper-slide > a.swiper-link > img.swiper-lazy
www.harpercollins.com/cdn/shop/files/9780063482128_540x.jpg?v=1774435270
Shadow Strike by Brad Taylor (9780063433199) div.swiper-wrapper > div.swiper-slide > a.swiper-link > img.swiper-lazy
/cdn/shop/files/9780063433229_82e95ebe-5668-44e5-a99d-5f9...
Afternoon Hours of a Hermit by Patrick Cottrell (9780063435063) div.swiper-wrapper > div.swiper-slide > a.swiper-link > img.swiper-lazy
www.harpercollins.com/cdn/shop/files/9780063435094_540x.jpg?v=1775244893
Remarkably Bright Creatures [Movie Tie-in] by Shelby Van Pelt (9780063512955) div.swiper-wrapper > div.swiper-slide > a.swiper-link > img.swiper-lazy
www.harpercollins.com/cdn/shop/files/9780063512955_540x.jpg?v=1775768828
What I Wish I Knew About Luck by Tina Seelig (9780063471368) div.swiper-wrapper > div.swiper-slide > a.swiper-link > img.swiper-lazy
www.harpercollins.com/cdn/shop/files/9780063471351_540x.jpg?v=1775581181
The Rough Side of the Mountain by Keisha Lance Bottoms (9780063420083) div.swiper-wrapper > div.swiper-slide > a.swiper-link > img.swiper-lazy
/cdn/shop/files/9780063420106_80915f20-55c1-44a5-a4a2-722...
Small Boat by Vincent Delecroix, Helen Stevenson (9780063491694) div.swiper-wrapper > div.swiper-slide > a.swiper-link > img.swiper-lazy
/cdn/shop/files/9780063491717_3fee07c1-906c-4f12-a0f7-281...
Reborn by Jaymin Eve (9780778306047) div.swiper-wrapper > div.swiper-slide > a.swiper-link > img.swiper-lazy
www.harpercollins.com/cdn/shop/files/9780778306047_540x.jpg?v=1776565436
Come Eat by Melissa Ben-Ishay (9780063451636) div.swiper-wrapper > div.swiper-slide > a.swiper-link > img.swiper-lazy
/cdn/shop/files/9780063451650_c3817265-b496-4468-b651-e46...
left-arrow div.row > div.col-1 > div#swiper-button-prev-16474506515f631378-1 > img
/cdn/shop/t/8/assets/carousel-left.svg?v=1499575885140700...
right arrow div.row > div.col-1 > div#swiper-button-next-16474506515f631378-1 > img
/cdn/shop/t/8/assets/carousel-right.svg?v=795100909965146...
left-arrow div.row > div.col-1 > div#leftArrow368c5917-cd88-40d0-8081-aa1be8e207a2 > img.leftArrowImg
/cdn/shop/t/8/assets/carousel-left.svg?v=1499575885140700...
right-arrow div.row > div.col-1 > div#rightArrow368c5917-cd88-40d0-8081-aa1be8e207a2 > img.rightArrowImg
/cdn/shop/t/8/assets/carousel-right.svg?v=795100909965146...
left-arrow div.row > div.col-1 > div#leftArrow1586898863765 > img.leftArrowImg
/cdn/shop/t/8/assets/carousel-left.svg?v=1499575885140700...
right-arrow div.row > div.col-1 > div#rightArrow1586898863765 > img.rightArrowImg
/cdn/shop/t/8/assets/carousel-right.svg?v=795100909965146...
Footer Logo footer.hcFooter > div#m-subNav > a > img.subHeadImg
/cdn/shop/files/footer-logo_7ce61f7b-377b-4234-a833-402fa...
Are you a childrens librarian or educator? div.roll-col > div.roll-call-container > a.imageUrl > img.rollCallImg
/cdn/shop/files/Harper_Stacks_thumbnail_-_new3_1110x.png?...
Are you a librarian? div.roll-col > div.roll-call-container > a.imageUrl > img.rollCallImg
www.harpercollins.com/cdn/shop/files/RC-Bookshelf_1110x.png?v=1614765644
Are you a book club? div.roll-col > div.roll-call-container > a.imageUrl > img.rollCallImg
www.harpercollins.com/cdn/shop/files/RC-person_1110x.png?v=1614765644
Are you an educator? div.roll-col > div.roll-call-container > a.imageUrl > img.rollCallImg
www.harpercollins.com/cdn/shop/files/RC-Apple_1110x.png?v=1614765644
Sunshine, Lemons and Sea Salt by Donna Hay (9780063514164) div.swiper-wrapper > div.swiper-slide > a.swiper-link > img.swiper-lazy
The Lost Cities of El Norte by Peter Stark (9780063383883) div.swiper-wrapper > div.swiper-slide > a.swiper-link > img.swiper-lazy
I Choose Me by Jennie Garth (9780778305637) div.swiper-wrapper > div.swiper-slide > a.swiper-link > img.swiper-lazy
Cherry Baby by Rainbow Rowell (9780063380264) div.swiper-wrapper > div.swiper-slide > a.swiper-link > img.swiper-lazy
The Auction (Deluxe Limited Edition) by Sadie Kincaid (9780778306085) div.swiper-wrapper > div.swiper-slide > a.swiper-link > img.swiper-lazy
The Left and the Lucky by Willy Vlautin (9780063346635) div.swiper-wrapper > div.swiper-slide > a.swiper-link > img.swiper-lazy
Japanese Gothic by Kylie Lee Baker (9781335001559) div.swiper-wrapper > div.swiper-slide > a.swiper-link > img.swiper-lazy
The Thorn Queen Deluxe Limited Edition by Sasha Peyton Smith (9780063481152) div.swiper-wrapper > div.swiper-slide > a.swiper-link > img.swiper-lazy
A Soldier's Wife by Blair Underwood (9780063211872) div.swiper-wrapper > div.swiper-slide > a.swiper-link > img.swiper-lazy
The Queen and Her Presidents by Susan Page (9780063397392) div.swiper-wrapper > div.swiper-slide > a.swiper-link > img.swiper-lazy
The Amalfi Curse by Sarah Penner (9780778308003) div.swiper-wrapper > div.swiper-slide > a.swiper-link > img.swiper-lazy
RFK Jr. by Isabel Vincent (9780063472280) div.swiper-wrapper > div.swiper-slide > a.swiper-link > img.swiper-lazy
Homesick Nomad by Brianna Madia (9780063440135) div.swiper-wrapper > div.swiper-slide > a.swiper-link > img.swiper-lazy
Burn the Haystack by Jennie Young, PhD (9780063447578) div.swiper-wrapper > div.swiper-slide > a.swiper-link > img.swiper-lazy
Release Me (Deluxe Limited Edition) by Tahereh Mafi (9780063480339) div.swiper-wrapper > div.swiper-slide > a.swiper-link > img.swiper-lazy
The Ending Writes Itself by Evelyn Clarke (9780063444614) div.swiper-wrapper > div.swiper-slide > a.swiper-link > img.swiper-lazy
What to Make of a Life by Jim Collins (9780063488809) div.swiper-wrapper > div.swiper-slide > a.swiper-link > img.swiper-lazy
Wild Darling by Alexandra Moody (9780063485235) div.swiper-wrapper > div.swiper-slide > a.swiper-link > img.swiper-lazy
Girl Dad by Sean Williams, Jay Davis (9780063464988) div.swiper-wrapper > div.swiper-slide > a.swiper-link > img.swiper-lazy
Starside (Deluxe Limited Edition) by Alex Aster (9780063462434) div.swiper-wrapper > div.swiper-slide > a.swiper-link > img.swiper-lazy
Phases by Brandy (9781335013279) div.swiper-wrapper > div.swiper-slide > a.swiper-link > img.swiper-lazy
The Wings That Bind (Deluxe Edition) by Briar Boleyn (9780778306351) div.swiper-wrapper > div.swiper-slide > a.swiper-link > img.swiper-lazy
Warriors: Changing Skies #3: Chasing Shadows by Erin Hunter (9780063357167) div.swiper-wrapper > div.swiper-slide > a.swiper-link > img.swiper-lazy
Wait With Me by Amy Daws (9781335219985) div.swiper-wrapper > div.swiper-slide > a.swiper-link > img.swiper-lazy
How Soccer Explains the World by Franklin Foer (9780063486768) div.swiper-wrapper > div.swiper-slide > a.swiper-link > img.swiper-lazy
Lake Effect by Cynthia D'Aprix Sweeney (9780063377684) div.swiper-wrapper > div.swiper-slide > a.swiper-link > img.swiper-lazy
What Mattered Most by Ty Herndon, David Ritz (9780063360105) div.swiper-wrapper > div.swiper-slide > a.swiper-link > img.swiper-lazy
How a Little Becomes a Lot by Eric Zimmer (9780063420809) div.swiper-wrapper > div.swiper-slide > a.swiper-link > img.swiper-lazy
Python's Kiss by Louise Erdrich (9780063375000) div.swiper-wrapper > div.swiper-slide > a.swiper-link > img.swiper-lazy
The Astral Library (Standard Edition) by Kate Quinn (9780063479753) div.swiper-wrapper > div.swiper-slide > a.swiper-link > img.swiper-lazy
Everyone in This Bank Is a Thief by Benjamin Stevenson (9780063434387) div.swiper-wrapper > div.swiper-slide > a.swiper-link > img.swiper-lazy
The Littlest Elephant by Katherine Applegate, Lita Judge (9780063357785) div.swiper-wrapper > div.swiper-slide > a.swiper-link > img.swiper-lazy
Black Out Loud by Geoff Bennett (9780063418172) div.swiper-wrapper > div.swiper-slide > a.swiper-link > img.swiper-lazy
City of Night Birds by Juhea Kim (9780063394759) div.swiper-wrapper > div.swiper-slide > a.swiper-link > img.swiper-lazy
Strange Buildings by Uketsu (9780063517806) div.swiper-wrapper > div.swiper-slide > a.swiper-link > img.swiper-lazy
While We’re Here by Anne Wynter, Micha Archer (9780063238299) div.swiper-wrapper > div.swiper-slide > a.swiper-link > img.swiper-lazy
Hooked by Asako Yuzuki, Polly Barton (9780063442412) div.swiper-wrapper > div.swiper-slide > a.swiper-link > img.swiper-lazy
This Will Be Interesting by E. B. Asher (9780063440319) div.swiper-wrapper > div.swiper-slide > a.swiper-link > img.swiper-lazy
No Friend to This House by Natalie Haynes (9780063258440) div.swiper-wrapper > div.swiper-slide > a.swiper-link > img.swiper-lazy
Life on the Bridge by Kaelynn Partlow (9780063493506) div.swiper-wrapper > div.swiper-slide > a.swiper-link > img.swiper-lazy
The Social Circle by Sophie Wan (9781525800061) div.swiper-wrapper > div.swiper-slide > a.swiper-link > img.swiper-lazy
HC_Home_TileAd_Cookbooks2026 div.swiper-wrapper > div.swiper-slide > a > img.visitOurImg
HC_Home_TileAd_Spring2026 div.swiper-wrapper > div.swiper-slide > a > img.visitOurImg
Tile NEW_SpringGarde_1 div.swiper-wrapper > div.swiper-slide > a > img.visitOurImg
Tile_DreamHarbor div.swiper-wrapper > div.swiper-slide > a > img.visitOurImg
Tile_Narnia div.swiper-wrapper > div.swiper-slide > a > img.visitOurImg
Tile_AmericanCl2 div.swiper-wrapper > div.swiper-slide > a > img.visitOurImg
Tile_Discworld2 div.swiper-wrapper > div.swiper-slide > a > img.visitOurImg
TileAd_CelebBkCb6 div.swiper-wrapper > div.swiper-slide > a > img.visitOurImg
Tile_Tolkien_8d7f0459 2d3c 4ddd 9ad0 fa058d95a565 div.swiper-wrapper > div.swiper-slide > a > img.visitOurImg
HarperCollins_Homepage_Graphic_Mobile_35949132 6911 4597 811b 67af11b5039c div.swiper-wrapper > div.swiper-slide > a > img.visitOurImg
TileAd_MinaLima div.swiper-wrapper > div.swiper-slide > a > img.visitOurImg
Tile.2_AgathaChris div.swiper-wrapper > div.swiper-slide > a > img.visitOurImg
Tile_UKLeGuin div.swiper-wrapper > div.swiper-slide > a > img.visitOurImg

More information about the performance of your application. These numbers don't directly affect the Performance score.

●Layout shift culprits
●Optimize DOM size
●LCP breakdown
●Modern HTTP
●Optimize viewport for mobile
●Minify CSS
●User Timing marks and measures 41 user timings
●Avoid long main-thread tasks 20 long tasks found
●Avoid non-composited animations 9 animated elements found
●Page didn't prevent back/forward cache restoration
●Network Requests
●Network Round Trip Times 70 ms
●Server Backend Latencies 150 ms
●Tasks
●Diagnostics
●Metrics
●Screenshot Thumbnails
●Final Screenshot
●Script Treemap Data
●Resources Summary
●Initial server response time was short Root document took 50 ms
●Avoid large layout shifts 3 layout shifts found
○INP breakdown
74

Accessibility

These checks highlight opportunities to improve the accessibility of your web app. Automatic detection can only detect a subset of issues and does not guarantee the accessibility of your web app, so manual testing is also encouraged.

ARIA

ARIA dialog elements without accessible names may prevent screen readers users from discerning the purpose of these elements. Learn how to make ARIA dialog elements more accessible.

Why this matters

Informational: a Permissions-Policy directive showing feature -> allowed origins.

Source: MDN Permissions-Policy

Failing Elements
Looking for Your Next Favorite Read? Get new releases, author news, recommendat… body.sailthru-overlay-no-scroll > section#sailthru-overlay-container

These are opportunities to improve the usage of ARIA in your application which may enhance the experience for users of assistive technology, like a screen reader.

Names and labels

When a button doesn't have an accessible name, screen readers announce it as "button", making it unusable for users who rely on screen readers. Learn how to make buttons more accessible.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
div.cart__contents > div.cart__header > div.cart__header_close > button.cart__close div.cart__contents > div.cart__header > div.cart__header_close > button.cart__close
body.sailthru-overlay-no-scroll > section#sailthru-overlay-container > div.sailthru-overlay > button.sailthru-overlay-close body.sailthru-overlay-no-scroll > section#sailthru-overlay-container > div.sailthru-overlay > button.sailthru-overlay-close

Informative elements should aim for short, descriptive alternate text. Decorative elements can be ignored with an empty alt attribute. Learn more about the `alt` attribute.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
nav#mobileNavWhole > div.leftHeader > a.navbar-brand > img nav#mobileNavWhole > div.leftHeader > a.navbar-brand > img
div.mobileIconContain > div.iconContainer > a#mobile-account-link > img div.mobileIconContain > div.iconContainer > a#mobile-account-link > img
div > div > div.sailthru_0_0_0 > img div > div > div.sailthru_0_0_0 > img

Screen reader users rely on frame titles to describe the contents of frames. Learn more about frame titles.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
div.container > div.row > div.col-md-10 > iframe#hc-signup div.container > div.row > div.col-md-10 > iframe#hc-signup

Link text (and alternate text for images, when used as links) that is discernible, unique, and focusable improves the navigation experience for screen reader users. Learn how to make links accessible.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
div.row > nav#mobileNavWhole > div.leftHeader > a.navbar-brand div.row > nav#mobileNavWhole > div.leftHeader > a.navbar-brand

These are opportunities to improve the semantics of the controls in your application. This may enhance the experience for users of assistive technology, like a screen reader.

Contrast

Low-contrast text is difficult or impossible for many users to read. Learn how to provide sufficient color contrast.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Stay up to date with new releases, author news, and reading picks—plus get 15% … body.sailthru-overlay-no-scroll > aside#shopify-section-header-promo-bar > a#header-promo-header-promo-bar > div.container
BESTSELLERS div#shopify-section-16474506515f631378 > ul#tabsMobile > li.nav-item > a.nav-link
COMING SOON div#shopify-section-16474506515f631378 > ul#tabsMobile > li.nav-item > a.nav-link
privacy notice div.col-md-10 > div.section-fine-print > p > a
privacypolicy@harpercollins.com div.col-md-10 > div.section-fine-print > p > a
Privacy Policy div.col-md-10 > div.section-fine-print > p > a
Terms of Service div.col-md-10 > div.section-fine-print > p > a
Looking for Your Next Favorite Read? div > div > div.sailthru_0_0_1 > h2.top
15% off div > div.sailthru_0_0_1 > div > strong
div.sailthru-overlay > div > div > input#sailthru-user-acquisition-email div.sailthru-overlay > div > div > input#sailthru-user-acquisition-email
privacypolicy@harpercollins.com div > div.sailthru_0_0_4 > div.legal > a

These are opportunities to improve the legibility of your content.

Navigation

Properly ordered headings that do not skip levels convey the semantic structure of the page, making it easier to navigate and understand when using assistive technologies. Learn more about heading order.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
New in Memoir & Biography div.row > div.col-md-4 > a.spotlight-block > h5
BROWSE AND SHOP section.rollCall > div.roll-call-header > div.roll-call-title > h5

These are opportunities to improve keyboard navigation in your application.

Best practices

Touch targets with sufficient size and spacing help users who may have difficulty targeting small controls to activate the targets. Learn more about touch targets.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Go to slide 1 div.browseAndShopSlider > div.row > div.swiper-pagination368c5917-cd88-40d0-8081-aa1be8e207a2 > span.swiper-pagination-bullet
Go to slide 2 div.browseAndShopSlider > div.row > div.swiper-pagination368c5917-cd88-40d0-8081-aa1be8e207a2 > span.swiper-pagination-bullet
Go to slide 3 div.browseAndShopSlider > div.row > div.swiper-pagination368c5917-cd88-40d0-8081-aa1be8e207a2 > span.swiper-pagination-bullet
Go to slide 4 div.browseAndShopSlider > div.row > div.swiper-pagination368c5917-cd88-40d0-8081-aa1be8e207a2 > span.swiper-pagination-bullet
Go to slide 5 div.browseAndShopSlider > div.row > div.swiper-pagination368c5917-cd88-40d0-8081-aa1be8e207a2 > span.swiper-pagination-bullet
Go to slide 6 div.browseAndShopSlider > div.row > div.swiper-pagination368c5917-cd88-40d0-8081-aa1be8e207a2 > span.swiper-pagination-bullet
Go to slide 7 div.browseAndShopSlider > div.row > div.swiper-pagination368c5917-cd88-40d0-8081-aa1be8e207a2 > span.swiper-pagination-bullet
Go to slide 8 div.browseAndShopSlider > div.row > div.swiper-pagination368c5917-cd88-40d0-8081-aa1be8e207a2 > span.swiper-pagination-bullet
Go to slide 9 div.browseAndShopSlider > div.row > div.swiper-pagination368c5917-cd88-40d0-8081-aa1be8e207a2 > span.swiper-pagination-bullet
Go to slide 10 div.browseAndShopSlider > div.row > div.swiper-pagination368c5917-cd88-40d0-8081-aa1be8e207a2 > span.swiper-pagination-bullet
Go to slide 1 div.browseAndShopSlider > div.row > div.swiper-pagination1586898863765 > span.swiper-pagination-bullet
Go to slide 2 div.browseAndShopSlider > div.row > div.swiper-pagination1586898863765 > span.swiper-pagination-bullet
Go to slide 3 div.browseAndShopSlider > div.row > div.swiper-pagination1586898863765 > span.swiper-pagination-bullet
Go to slide 4 div.browseAndShopSlider > div.row > div.swiper-pagination1586898863765 > span.swiper-pagination-bullet
Go to slide 5 div.browseAndShopSlider > div.row > div.swiper-pagination1586898863765 > span.swiper-pagination-bullet
Go to slide 6 div.browseAndShopSlider > div.row > div.swiper-pagination1586898863765 > span.swiper-pagination-bullet
Go to slide 7 div.browseAndShopSlider > div.row > div.swiper-pagination1586898863765 > span.swiper-pagination-bullet
Go to slide 8 div.browseAndShopSlider > div.row > div.swiper-pagination1586898863765 > span.swiper-pagination-bullet
Go to slide 9 div.browseAndShopSlider > div.row > div.swiper-pagination1586898863765 > span.swiper-pagination-bullet

These items highlight common accessibility best practices.

Visible text labels that do not match the accessible name can result in a confusing experience for screen reader users. Learn more about accessible names.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Shop Now div.swiper-container > div.swiper-wrapper > div.swiper-slide > a.fourByTwo
○Interactive controls are keyboard focusable
○Interactive elements indicate their purpose and state
○The page has a logical tab order
○Visual order on the page follows DOM order
○User focus is not accidentally trapped in a region
○The user's focus is directed to new content added to the page
○HTML5 landmark elements are used to improve navigation
○Offscreen content is hidden from assistive technology
○Custom controls have associated labels
○Custom controls have ARIA roles
●`[aria-*]` attributes match their roles
●`[aria-hidden="true"]` is not present on the document `<body>`
●`[role]`s have all required `[aria-*]` attributes
●`[role]` values are valid
●`[aria-*]` attributes have valid values
●`[aria-*]` attributes are valid and not misspelled
●Form elements have associated labels
●`[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5.
●`button`, `link`, and `menuitem` elements have accessible names
●ARIA attributes are used as specified for the element's role
●`[aria-hidden="true"]` elements do not contain focusable descendents
●Elements use only permitted ARIA attributes
●Document has a `<title>` element
●`<html>` element has a `[lang]` attribute
●`<html>` element has a valid value for its `[lang]` attribute
●Links are distinguishable without relying on color.
●Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).
●List items (`<li>`) are contained within `<ul>`, `<ol>` or `<menu>` parent elements
●No element has a `[tabindex]` value greater than 0
●Document has a main landmark.
●Deprecated ARIA roles were not used
●Identical links have the same purpose.
○`[accesskey]` values are unique
○ARIA input fields have accessible names
○ARIA `meter` elements have accessible names
○ARIA `progressbar` elements have accessible names
○Elements with an ARIA `[role]` that require children to contain a specific `[role]` have all required children.
○`[role]`s are contained by their required parent element
○Elements with the `role=text` attribute do not have focusable descendents.
○ARIA toggle fields have accessible names
○ARIA `tooltip` elements have accessible names
○ARIA `treeitem` elements have accessible names
○The page contains a heading, skip link, or landmark region
○`<dl>`'s contain only properly-ordered `<dt>` and `<dd>` groups, `<script>`, `<template>` or `<div>` elements.
○Definition list items are wrapped in `<dl>` elements
○ARIA IDs are unique
○No form fields have multiple labels
○`<html>` element has an `[xml:lang]` attribute with the same base language as the `[lang]` attribute.
○Input buttons have discernible text.
○`<input type="image">` elements have `[alt]` text
○The document does not use `<meta http-equiv="refresh">`
○`<object>` elements have alternate text
○Select elements have associated label elements.
○Skip links are focusable.
○Cells in a `<table>` element that use the `[headers]` attribute refer to table cells within the same table.
○`<th>` elements and elements with `[role="columnheader"/"rowheader"]` have data cells they describe.
○`[lang]` attributes have a valid value
○`<video>` elements contain a `<track>` element with `[kind="captions"]`
○Tables have different content in the summary attribute and `<caption>`.
○All heading elements contain content.
○Uses ARIA roles only on compatible elements
○Image elements do not have `[alt]` attributes that are redundant text.
○Tables use `<caption>` instead of cells with the `[colspan]` attribute to indicate a caption.
○`<td>` elements in a large `<table>` have one or more table headers.
73

Best Practices

User Experience

Image natural dimensions should be proportional to the display size and the pixel ratio to maximize image clarity. Learn how to provide responsive images.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLDisplayed sizeActual sizeExpected size
nav#mobileNavWhole > div.leftHeader > a.navbar-brand > img nav#mobileNavWhole > div.leftHeader > a.navbar-brand > img
www.harpercollins.com/cdn/shop/files/FireandWaterLogo_30x.jpg?v=161476564430 x 3030 x 3245 x 45

General

Deprecated APIs will eventually be removed from the browser. Learn more about deprecated APIs.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Deprecation / WarningSource
AttributionReporting
/cdn/shopifycloud/storefront/assets/shop_events_listener-...

Errors logged to the console indicate unresolved problems. They can come from network request failures and other browser concerns. Learn more about this errors in console diagnostic audit

Why this matters

Performance issues directly impact user engagement and conversion rates.

SourceDescription
/cdn/shop/t/8/assets/vue.min.js?v=17382022256029746221158... line 5, col 11751
ReferenceError: $ is not defined at wn.mounted (https://www.harpercollins.com/:2592:9) at He (https://www.harpercollins.com/cdn/shop/t/8/assets/vue.min.js?v=173820222560297462211589214883:6:11397) at Yt (https://www.harpercollins.com/cdn/shop/t/8/assets/vue.min.js?v=173820222560297462211589214883:6:25339) at https://www.harpercollins.com/cdn/shop/t/8/assets/vue.min.js?v=173820222560297462211589214883:6:68312 at wn.$mount (https://www.harpercollins.com/cdn/shop/t/8/assets/vue.min.js?v=173820222560297462211589214883:6:68331) at wn.$mount (https://www.harpercollins.com/cdn/shop/t/8/assets/vue.min.js?v=173820222560297462211589214883:6:93549) at t._init (https://www.harpercollins.com/cdn/shop/t/8/assets/vue.min.js?v=173820222560297462211589214883:6:33038) at new wn (https://www.harpercollins.com/cdn/shop/t/8/assets/vue.min.js?v=173820222560297462211589214883:6:30368) at https://www.harpercollins.com/:2523:13
/cdn/shop/t/8/assets/vue.min.js?v=17382022256029746221158... line 5, col 11751
ReferenceError: axios is not defined at wn.refreshCart (https://www.harpercollins.com/:2608:9) at wn.mounted (https://www.harpercollins.com/:2621:12) at He (https://www.harpercollins.com/cdn/shop/t/8/assets/vue.min.js?v=173820222560297462211589214883:6:11397) at Yt (https://www.harpercollins.com/cdn/shop/t/8/assets/vue.min.js?v=173820222560297462211589214883:6:25339) at https://www.harpercollins.com/cdn/shop/t/8/assets/vue.min.js?v=173820222560297462211589214883:6:68312 at wn.$mount (https://www.harpercollins.com/cdn/shop/t/8/assets/vue.min.js?v=173820222560297462211589214883:6:68331) at wn.$mount (https://www.harpercollins.com/cdn/shop/t/8/assets/vue.min.js?v=173820222560297462211589214883:6:93549) at t._init (https://www.harpercollins.com/cdn/shop/t/8/assets/vue.min.js?v=173820222560297462211589214883:6:33038) at new wn (https://www.harpercollins.com/cdn/shop/t/8/assets/vue.min.js?v=173820222560297462211589214883:6:30368) at https://www.harpercollins.com/:2599:14
www.harpercollins.com/ line 5807, col 36
SyntaxError: Failed to execute 'json' on 'Response': Unexpected token 'T', "There was "... is not valid JSON at https://www.harpercollins.com/:5750:45 at Array.map (<anonymous>) at https://www.harpercollins.com/:5748:67
TypeError: Cannot read properties of null (reading 'querySelectorAll') at <anonymous>:1:97 at https://www.googletagmanager.com/gtm.js?id=GTM-5J46CG3:1032:429 at uR (https://www.googletagmanager.com/gtm.js?id=GTM-5J46CG3:1034:31) at Md.tR (https://www.googletagmanager.com/gtm.js?id=GTM-5J46CG3:1031:92) at Md.<anonymous> (https://www.googletagmanager.com/gtm.js?id=GTM-5J46CG3:421:187) at k.apply (https://www.googletagmanager.com/gtm.js?id=GTM-5J46CG3:347:466) at fb (https://www.googletagmanager.com/gtm.js?id=GTM-5J46CG3:310:719) at eb (https://www.googletagmanager.com/gtm.js?id=GTM-5J46CG3:310:470) at Md.<anonymous> (https://www.googletagmanager.com/gtm.js?id=GTM-5J46CG3:371:473) at k.apply (https://www.googletagmanager.com/gtm.js?id=GTM-5J46CG3:347:466)
●Uses HTTPS
●Avoids third-party cookies
●Allows users to paste into input fields
●Avoids requesting the geolocation permission on page load
●Avoids requesting the notification permission on page load
●Displays images with correct aspect ratio
●Page has the HTML doctype
●Properly defines charset
●No issues in the `Issues` panel in Chrome Devtools
●Ensure CSP is effective against XSS attacks
●Use a strong HSTS policy
●Ensure proper origin isolation with COOP
●Mitigate DOM-based XSS with Trusted Types
●Detected JavaScript libraries
●Page has valid source maps
○Redirects HTTP traffic to HTTPS
○Mitigate clickjacking with XFO or CSP
92

SEO

These checks ensure that your page is following basic search engine optimization advice. There are many additional factors Lighthouse does not score here that may affect your search ranking, including performance on Core Web Vitals. Learn more about Google Search Essentials.

Content Best Practices

Informative elements should aim for short, descriptive alternate text. Decorative elements can be ignored with an empty alt attribute. Learn more about the `alt` attribute.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
nav#mobileNavWhole > div.leftHeader > a.navbar-brand > img nav#mobileNavWhole > div.leftHeader > a.navbar-brand > img
div.mobileIconContain > div.iconContainer > a#mobile-account-link > img div.mobileIconContain > div.iconContainer > a#mobile-account-link > img
div > div > div.sailthru_0_0_0 > img div > div > div.sailthru_0_0_0 > img

Format your HTML in a way that enables crawlers to better understand your app’s content.

○Structured data is valid
●Page isn’t blocked from indexing
●Document has a `<title>` element
●Document has a meta description
●Page has successful HTTP status code
●Links have descriptive text
●Links are crawlable
●robots.txt is valid
●Document has a valid `hreflang`
●Document has a valid `rel=canonical`

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