Lighthouse Mobile

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

SCORE

GRADE

FIX

REVIEW

PASS

INFO

Detailed Report

Audit breakdown by category with detailed findings.

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.

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.

URL	Est Savings
fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2	40 ms

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.

	URL	Resource Size	Est Savings
Video thumbnail `section#improve-vocabulary > div#vocabtrainer_video > div > img.kWidgetCentered`	/p/4764982/sp/476498200/thumbnail/entry_id/1_ex1tt6og/ver...	113.2 KiB	93.6 KiB
types of activities and word lists `div.looking-for > section#teach-words > picture > img`	cdn.vocabulary.com/images/home/looking-for/teach-words-320-2x-1fpe6bf.png	48.1 KiB	24.4 KiB
Finalist from 2024 Tech Edvocate Awards in Best Literacy App or Tool `div.awards > div.badges > div.badge > img`	cdn.vocabulary.com/images/home/awards/tech-edvocate-award-2024-1d2ohev.png	23.7 KiB	21.2 KiB
Winner from 2024 Tech and Learning Awards of Excellence in Secondary Education `div.awards > div.badges > div.badge > img`	cdn.vocabulary.com/images/home/awards/tech-learning-best-of-2024-l78c4x.png	20.3 KiB	18.1 KiB
Winner of The Journal 2024 Product of the Year `div.awards > div.badges > div.badge > img`	/images/home/awards/the-journal-product-of-year-2024-12pa...	16.9 KiB	14.7 KiB
Honorable Mention from the 2024 Readers' Choice Awards `div.awards > div.badges > div.badge > img`	cdn.vocabulary.com/images/home/awards/readers-choice-award-2024-17e1piz.png	16.0 KiB	14.3 KiB
Vocabulary.com `div.limited-width > nav.main > a.logo > img.screen-only`	cdn.vocabulary.com/images/header/logo-1wobq9i.png	14.3 KiB	13.5 KiB
figure.page-1 > div.box-item-carousel > div.box-loc-portrait-title > img.img-portrait `figure.page-1 > div.box-item-carousel > div.box-loc-portrait-title > img.img-portrait`	/images/carousel/home-learner/elementary-school-ela-teach...	13.0 KiB	8.9 KiB
dictionary definition of the word, vocabulary `div.looking-for > section#dictionary-for-learning > picture > img`	cdn.vocabulary.com/images/home/looking-for/dictionary-320-2x-1jzpetw.png	35.2 KiB	6.4 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-8-IMG

nodeLabel: dictionary definition of the word, vocabulary

path: 1,HTML,1,BODY,0,DIV,3,DIV,0,DIV,0,DIV,0,SECTION,0,PICTURE,4,IMG

selector: div.looking-for > section#dictionary-for-learning > picture > img

snippet: <img src="https://cdn.vocabulary.com/images/home/looking-for/dictionary-320-2x-1jzpe…" alt="dictionary definition of the word, vocabulary">

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.

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

value: No additional origins are good candidates for preconnecting

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.

URL	Transfer Size	Duration
/css2?family=Merriweather:ital,wght@0,300;0,400;0,700;1,3...	3.2 KiB	820 ms
cdn.vocabulary.com/css/home-1v1i9vp.css	3.0 KiB
cdn.vocabulary.com/css/header-18eveua.css	4.9 KiB	796 ms
cdn.vocabulary.com/css/bowl/carousel-ikwu41.css	869 B
cdn.vocabulary.com/css/fonts/ss-standard-5s5b7z.css	2.6 KiB
cdn.vocabulary.com/css/fonts/ss-symbolicons-block-67mxq6.css	7.0 KiB
cdn.vocabulary.com/css/fonts/ss-social-circle-e51wc0.css	1.4 KiB
cdn.vocabulary.com/css/achievements-4to21o.css	14.8 KiB	154 ms
cdn.vocabulary.com/css/main-1knvpzy.css	7.4 KiB	154 ms
/recaptcha/enterprise.js?render=6LeddZEqAAAAAHAYLf9Sz82cN...	1.1 KiB	888 ms
cdn.vocabulary.com/css/dictionary-1nvmifl.css	7.0 KiB	154 ms
cdn.vocabulary.com/css/progress-1x2p62h.css	965 B
cdn.vocabulary.com/css/leaderboards-xxg0un.css	1.9 KiB
cdn.vocabulary.com/js/module-15xwhp0.js	24.9 KiB	154 ms
cdn.vocabulary.com/lib/jquery-1eev1tf.js	30.6 KiB	154 ms

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.

Request	Cache TTL	Transfer Size
/p/4764982/sp/476498200/thumbnail/entry_id/1_ex1tt6og/ver...	3600.0 s	114.1 KiB
/images/carousel/home-learner/high-school-science-teacher...	0.0 ms	57.3 KiB
www.vocabulary.com/images/carousel/home-learner/ninth-grade-ela-teacher-180.png	0.0 ms	45.9 KiB
www.vocabulary.com/images/carousel/home-learner/middle-school-principal-180.png	0.0 ms	41.9 KiB
/p/4764982/sp/476498200/embedIframeJs/uiconf_id/51260142/...	349.0 s	21.5 KiB
/images/carousel/home-learner/middle-school-ela-teacher-1...	0.0 ms	18.8 KiB
www.vocabulary.com/images/carousel/home-learner/high-school-ela-teacher-180.png	0.0 ms	16.3 KiB
/images/carousel/home-learner/middle-school-social-studie...	0.0 ms	15.1 KiB
www.vocabulary.com/images/carousel/home-learner/eigth-grade-ela-teacher-180.png	0.0 ms	15.0 KiB
/images/carousel/home-learner/pre-ap-english-9-honors-tea...	0.0 ms	14.1 KiB
/images/carousel/home-learner/elementary-school-ela-teach...	0.0 ms	13.4 KiB
www.gstatic.com/recaptcha/api2/logo_48.png	604800.0 s	2.3 KiB

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

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: 1.1 s

URL	Time Spent
vocabulary.com/	1.1 s
www.vocabulary.com/	0.0 ms

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

Diagnostics

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: 500 ms 273.7 KiB

URL	Transfer Size	Est Savings
www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js	361.8 KiB	177.1 KiB
cdn.vocabulary.com/js3/mixpanel.bAyToM0F.bundle.js	124.0 KiB	96.6 KiB

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.

Category	Time Spent
Script Evaluation	973 ms
Other	754 ms
Style & Layout	375 ms
Script Parsing & Compilation	103 ms
Parse HTML & CSS	89 ms
Rendering	75 ms
Garbage Collection	13 ms

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: 0.0 ms 14.6 KiB

URL	Transfer Size	Est Savings
cdn.vocabulary.com/css/achievements-4to21o.css	14.6 KiB	14.6 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
dictionary definition of the word, vocabulary `div.looking-for > section#dictionary-for-learning > picture > img`	cdn.vocabulary.com/images/home/looking-for/dictionary-320-2x-1jzpetw.png
types of activities and word lists `div.looking-for > section#teach-words > picture > img`	cdn.vocabulary.com/images/home/looking-for/teach-words-320-2x-1fpe6bf.png
Finalist from 2024 Tech Edvocate Awards in Best Literacy App or Tool `div.awards > div.badges > div.badge > img`	cdn.vocabulary.com/images/home/awards/tech-edvocate-award-2024-1d2ohev.png
Winner of The Journal 2024 Product of the Year `div.awards > div.badges > div.badge > img`	/images/home/awards/the-journal-product-of-year-2024-12pa...
Winner from 2024 Tech and Learning Awards of Excellence in Secondary Education `div.awards > div.badges > div.badge > img`	cdn.vocabulary.com/images/home/awards/tech-learning-best-of-2024-l78c4x.png
Honorable Mention from the 2024 Readers' Choice Awards `div.awards > div.badges > div.badge > img`	cdn.vocabulary.com/images/home/awards/readers-choice-award-2024-17e1piz.png
IXL logo `div.ftr-legal > div.box-ixl-brands-legal-lks > div.box-logo-txt-logo > img.logo-ixl`	cdn.vocabulary.com/images/footer/logo-ixl-learning-ab1nek.svg
IXL logo `div.ftr-legal > div.box-ixl-brands-legal-lks > div.box-logo-txt-logo > img.logo-ixl`	cdn.vocabulary.com/images/footer/logo-ixl-learning-ab1nek.svg
vocabulary.com logo `div.ftr-legal > div.box-ixl-brands-legal-lks > div.box-logo-txt-logo > img.logo-vocabulary`	cdn.vocabulary.com/images/footer/logo-vocab-green-check-for-ftr-4lic3k.svg
vocabulary.com logo `div.ftr-legal > div.box-ixl-brands-legal-lks > div.box-logo-txt-logo > img.logo-vocabulary`	cdn.vocabulary.com/images/footer/logo-vocab-green-check-for-ftr-4lic3k.svg

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

●Max Potential First Input Delay 110 ms

●Layout shift culprits

●Optimize DOM size

●Forced reflow

●LCP breakdown

●Modern HTTP

●Optimize viewport for mobile

●Minify CSS

●Minify JavaScript

●Avoids enormous network payloads Total size was 2,080 KiB

●JavaScript execution time 0.9 s

●Avoid long main-thread tasks 9 long tasks found

●Page didn't prevent back/forward cache restoration

●Network Requests

●Network Round Trip Times 40 ms

●Server Backend Latencies 310 ms

●Tasks

●Diagnostics

●Metrics

●Screenshot Thumbnails

●Final Screenshot

●Script Treemap Data

●Resources Summary

●Initial server response time was short Root document took 350 ms

●Avoid large layout shifts 2 layout shifts found

○INP breakdown

○User Timing marks and measures

○Avoid non-composited animations

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.

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
Log in `div.limited-width > nav.main > div.logininfo > a.login`
Sign up `div.limited-width > nav.main > div.logininfo > a.signup`
FOR LEARNERS `div.looking-for > section#improve-vocabulary > div.description > div.label`
FOR EDUCATORS `div.looking-for > section#teach-words > div.description > div.label`
Learn more `div.looking-for > section#teach-words > div.description > a.explore-more`
Administrators `div.box-vocab-home-testimonials > div.box-testimonial-app > div.box-testimonial-filters > button.btn-filter-administrators`
Teachers `div.box-vocab-home-testimonials > div.box-testimonial-app > div.box-testimonial-filters > button.btn-filter-teachers`
Learners `div.box-vocab-home-testimonials > div.box-testimonial-app > div.box-testimonial-filters > button.btn-filter-learners`
Put your school on the map `div#page > div#pageContent > div.bowl-signup > div.label`
Get involved `div#pageContent > div.bowl-signup > div.stats > a.button`
Get started `div#page > div#pageContent > div.bowl-signup > a.button`
I Agree `div.cookie-privacy-banner > div.limited-width > p > a.button`

These are opportunities to improve the legibility of your content.

Best practices

One main landmark helps screen reader users navigate a web page. Learn more about landmarks.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
html `html`

These items highlight common accessibility best practices.

○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

●Buttons have an accessible name

●Image elements have `[alt]` attributes

●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

●`<frame>` or `<iframe>` elements have a title

●`<html>` element has a `[lang]` attribute

●`<html>` element has a valid value for its `[lang]` attribute

●Links are distinguishable without relying on color.

●Links have a discernible name

●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

●Touch targets have sufficient size and spacing.

●Heading elements appear in a sequentially-descending order

●Deprecated ARIA roles were not used

●Identical links have the same purpose.

○`[accesskey]` values are unique

○Elements with `role="dialog"` or `role="alertdialog"` have accessible names.

○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.

○Elements with visible text labels have matching accessible names.

○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.

100

Best Practices

●Uses HTTPS

●Avoids deprecated APIs

●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

●Serves images with appropriate resolution

●Page has the HTML doctype

●Properly defines charset

●No browser errors logged to the console

●No issues in the `Issues` panel in Chrome Devtools

●Ensure CSP is effective against XSS attacks

●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

○Use a strong HSTS policy

○Mitigate clickjacking with XFO or CSP

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

Descriptive link text helps search engines understand your content. Learn how to make links more accessible.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Link destination	Link Text
www.vocabulary.com/dictionary/	Learn more
www.vocabulary.com/for-educators/	Learn more
www.vocabulary.com/membership/success-stories/	See more
www.vocabulary.com/privacy/	Learn more

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 are crawlable

●robots.txt is valid

●Image elements have `[alt]` attributes

●Document has a valid `hreflang`

●Document has a valid `rel=canonical`