Lighthouse Desktop

· 0 checks — Desktop 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.

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
/gw/photo.php?u=https://uc.udn.com.tw/photo/t3/2026/04/17...	3600.0 s	193.8 KiB
connect.facebook.net/en_US/fbevents.js	1200.0 s	96.6 KiB
connect.facebook.net/zh_TW/bundle/sdk.js/	1200.0 s	77.9 KiB
/upfiles/B_ED/EDITOR_RECOMM/PSN_PHOTO/3375/f_RECOMM_15341...	30.0 s	45.5 KiB
/signals/config/351257012036020?v=2.9.303&r=stable&domain...	1200.0 s	44.8 KiB
pagead2.googlesyndication.com/pagead/js/rum.js	3600.0 s	25.1 KiB
/gw/photo.php?u=https://uc.udn.com.tw/photo/t3/2026/03/30...	691200.0 s	166.4 KiB
www.google-analytics.com/analytics.js	7200.0 s	20.9 KiB
static.criteo.net/js/ld/publishertag.prebid.js	86400.0 s	31.3 KiB
udn.com/upf/static/common/vote/vote-default-1.jpg	691200.0 s	111.8 KiB
udn.com/static/js/vendor.bundle.js?202604201435	691200.0 s	85.9 KiB
/gw/photo.php?u=https://cdn.udn.com/img/600/photo/web/vid...	3600.0 s	10.0 KiB
p.udn.com.tw/upf/static/common/prebid4.35.0_20210415.js	1209600.0 s	70.7 KiB
/gw/photo.php?u=https://cdn.udn.com/img/600/photo/web/vid...	3600.0 s	7.6 KiB
/gw/photo.php?u=https://uc.udn.com.tw/photo/t3/2026/04/20...	691200.0 s	53.0 KiB
connect.facebook.net/zh_TW/sdk.js#xfbml=1&version=v5.0&appId=350231215126101	1200.0 s	5.0 KiB
/gw/photo.php?u=https://cdn.udn.com/img/600/photo/web/vid...	3600.0 s	5.0 KiB
udn.com/static/img/udn-loading.png	691200.0 s	39.9 KiB
udn.com/static/img/udn-loading.webp	691200.0 s	37.3 KiB
/gw/photo.php?u=https://uc.udn.com.tw/photo/t3/2026/04/21...	691200.0 s	37.0 KiB
/gw/photo.php?u=/photo/t3/2026/04/20/34871775.jpg&M=2&x=&...	691200.0 s	33.0 KiB
udn.com/static/css/index.css?202604201435	691200.0 s	29.9 KiB
udn.com/static/js/index.bundle.js?202604201435	691200.0 s	29.9 KiB
/gw/photo.php?u=https://uc.udn.com.tw/photo/t3/2026/04/22...	691200.0 s	29.8 KiB
sb.scorecardresearch.com/internal-cs/default/beacon.js	86400.0 s	6.7 KiB
/gw/photo.php?u=https://p.udn.com.tw/upf/2014_banners/hyp...	691200.0 s	26.4 KiB
/43NkSywDNJr3hLs7eh-TCw9KeQYnVvKuAqLtv5OQzIOtOGg3ZTJL3gGI...	86400.0 s	6.5 KiB
/gw/photo.php?u=https://uc.udn.com.tw/photo/t3/2026/04/20...	691200.0 s	24.5 KiB
/gw/photo.php?u=https://uc.udn.com.tw/photo/t3/2026/04/20...	691200.0 s	21.0 KiB
/gw/photo.php?u=https://uc.udn.com.tw/photo/t3/2026/04/21...	691200.0 s	20.7 KiB
/gw/photo.php?u=https://uc.udn.com.tw/photo/t3/2026/03/30...	691200.0 s	17.5 KiB
/gw/photo.php?u=https://uc.udn.com.tw/photo/t3/2026/04/21...	691200.0 s	17.1 KiB
/gw/photo.php?u=https://uc.udn.com.tw/photo/t3/2026/04/13...	691200.0 s	15.9 KiB
/gw/photo.php?u=https://uc.udn.com.tw/photo/t3/2026/04/22...	691200.0 s	15.7 KiB
p.udn.com.tw/upf/static/common/udn-fingerprint.umd.js?12	1209600.0 s	15.2 KiB
/gw/photo.php?u=https://uc.udn.com.tw/photo/t3/2026/04/20...	691200.0 s	14.3 KiB
/gw/photo.php?u=https://uc.udn.com.tw/photo/t3/2026/04/22...	691200.0 s	14.3 KiB
/gw/photo.php?u=https://uc.udn.com.tw/photo/t3/2026/04/21...	691200.0 s	13.4 KiB
pm-widget.taboola.com/udntw-udndesktop/load.js	3600.0 s	1.4 KiB
/gw/photo.php?u=https://uc.udn.com.tw/photo/t3/2026/04/21...	691200.0 s	10.5 KiB
/gw/photo.php?u=https://uc.udn.com.tw/photo/t3/2026/04/21...	691200.0 s	9.6 KiB
/gw/photo.php?u=https://uc.udn.com.tw/photo/t3/2026/04/21...	691200.0 s	9.4 KiB
/gw/photo.php?u=https://uc.udn.com.tw/photo/t3/2026/04/21...	691200.0 s	9.2 KiB
d.line-scdn.net/r/web/social-plugin/js/thirdparty/loader.min.js	73657.0 s	2.0 KiB
p.udn.com.tw/upf/static/common/recommendation/recommendation-system.js	1209600.0 s	7.8 KiB
udn.com/static/js/lit-html.bundle.js?tsb=1770016465782	691200.0 s	6.0 KiB
udn.com/static/js/google-dfp-native.js?202604201435	691200.0 s	5.0 KiB
udn.com/static/js/udn-submenu.bundle.js?tsb=1770016465782	691200.0 s	4.9 KiB
/gw/photo.php?u=https://uc.udn.com.tw/photo/t3/2026/04/10...	691200.0 s	3.9 KiB
p.udn.com.tw/upf/static/common/ab-test-grouping.js	1209600.0 s	3.4 KiB
udn.com/static/img/logo.svg?2020020601	691200.0 s	3.1 KiB
udn.com/static/img/logo.svg?20200206	691200.0 s	3.1 KiB
udn.com/static/js/utils_head.bundle.js?202604201435	691200.0 s	3.0 KiB
udn.com/static/js/webcomponents-template.bundle.js?tsb=1770016465782	691200.0 s	2.8 KiB
udn.com/static/img/weather/001.svg	691200.0 s	2.5 KiB
udn.com/upf/static/common/md5.js?1	691200.0 s	2.3 KiB
udn.com/static/css/google-dfp-native.css?202604201435	691200.0 s	2.2 KiB
udn.com/static/js/firebase.js?t=2025010202	691200.0 s	2.1 KiB
udn.com/static/img/aqi/aqi-normal.svg	691200.0 s	1.5 KiB
udn.com/static/js/vendor_head.bundle.js?202604201435	691200.0 s	1.1 KiB
udn.com/upf/news/2024/orange_logo_2024.svg	691200.0 s	1.0 KiB
udn.com/static/js/firebase-config.js	691200.0 s	971 B
/tr/?id=351257012036020&ev=PageView&dl=https%3A%2F%2Fudn....	0.0 ms	19 B

Layout shifts occur when elements move absent any user interaction. Investigate the causes of layout shifts, such as elements being added, removed, or their fonts changing as the page loads.

Why this matters

Performance issues directly impact user engagement and conversion rates.

headings: [map[key:node label:Element subItemsHeading:map[key:extra] valueType:node] map[granularity:0.001 key:score label:Layout shift score subItemsHeading:map[key:cause valueType:text] valueType:numeric]]

items: [map[node:map[type:text value:Total] score:0.124733] map[node:map[boundingRect:map[bottom:831 height:46 left:-695 right:-73 top:785 width:622] lhId:page-17-A nodeLabel:庫克交棒硬體大將特納斯 9月接掌蘋果CEO path:1,HTML,1,BODY,12,MAIN,0,DIV,6,SECTION,7,DIV,0,SECTION,0,SECTION,0,DIV,1,DIV,0,H2,0,A selector:div.slide-section > div.slide-links > h2 > a snippet:<a href="https://udn.com/news/story/7240/9456233?from=udn_ch2_menu_v2_main_index" data-story_list="list_slider_1"> type:node] score:0.094285 subItems:map[items:[map[cause:Web font extra:map[type:url value:https://fonts.gstatic.com/s/notosanstc/v39/-nF7OG829Oofr2wohFbTp9iFOisNA_cTyNromxqQuEMQ2wHYwbnmy1R1jDujLebozBXCo2qYhRo.119.woff2]]] type:subitems]] map[node:map[boundingRect:map[bottom:857 height:20 left:-671 right:-360 top:837 width:311] lhId:page-22-A nodeLabel:接棒庫克游泳冠軍特納斯要延續傳奇故事 path:1,HTML,1,BODY,12,MAIN,0,DIV,6,SECTION,7,DIV,0,SECTION,0,SECTION,0,DIV,1,DIV,1,DIV,0,H3,0,A selector:div.slide-links > div.slide-divider > h3 > a snippet:<a href="https://udn.com/news/story/7240/9456240?from=udn_ch2_menu_v2_main_index" data-story_list="list_slider_1"> type:node] score:0.029421 subItems:map[items:[map[cause:Web font extra:map[type:url value:https://fonts.gstatic.com/s/notosanstc/v39/-nF7OG829Oofr2wohFbTp9iFOisNA_cTyNromxqQuEMQ2wHYwbnmy1R1jDujLebozBXCo2qYhRo.117.woff2]] map[cause:Web font extra:map[type:url value:https://fonts.gstatic.com/s/notosanstc/v39/-nF7OG829Oofr2wohFbTp9iFOisNA_cTyNromxqQuEMQ2wHYwbnmy1R1jDujLebozBXCo2qYhRo.115.woff2]] map[cause:Web font extra:map[type:url value:https://fonts.gstatic.com/s/notosanstc/v39/-nF7OG829Oofr2wohFbTp9iFOisNA_cTyNromxqQuEMQ2wHYwbnmy1R1jDujLebozBXCo2qYhRo.113.woff2]] map[cause:Web font extra:map[type:url value:https://fonts.gstatic.com/s/notosanstc/v39/-nF7OG829Oofr2wohFbTp9iFOisNA_cTyNromxqQuEMQ2wHYwbnmy1R1jDujLebozBXCo2qYhRo.111.woff2]] map[cause:Web font extra:map[type:url value:https://fonts.gstatic.com/s/notosanstc/v39/-nF7OG829Oofr2wohFbTp9iFOisNA_cTyNromxqQuEMQ2wHYwbnmy1R1jDujLebozBXCo2qYhRo.118.woff2]] map[cause:Web font extra:map[type:url value:https://fonts.gstatic.com/s/notosanstc/v39/-nF7OG829Oofr2wohFbTp9iFOisNA_cTyNromxqQuEMQ2wHYwbnmy1R1jDujLebozBXCo2qYhRo.116.woff2]] map[cause:Web font extra:map[type:url value:https://fonts.gstatic.com/s/notosanstc/v39/-nF7OG829Oofr2wohFbTp9iFOisNA_cTyNromxqQuEMQ2wHYwbnmy1R1jDujLebozBXCo2qYhRo.112.woff2]] map[cause:Web font extra:map[type:url value:https://fonts.gstatic.com/s/notosanstc/v39/-nF7OG829Oofr2wohFbTp9iFOisNA_cTyNromxqQuEMQ2wHYwbnmy1R1jDujLebozBXCo2qYhRo.108.woff2]] map[cause:Web font extra:map[type:url value:https://fonts.gstatic.com/s/notosanstc/v39/-nF7OG829Oofr2wohFbTp9i1OCEKIfVZ1w.woff2]] map[cause:Web font extra:map[type:url value:https://fonts.gstatic.com/s/notosanstc/v39/-nF7OG829Oofr2wohFbTp9iFOisNA_cTyNromxqQuEMQ2wHYwbnmy1R1jDujLebozBXCo2qYhRo.104.woff2]] map[cause:Web font extra:map[type:url value:https://fonts.gstatic.com/s/notosanstc/v39/-nF7OG829Oofr2wohFbTp9iFOisNA_cTyNromxqQuEMQ2wHYwbnmy1R1jDujLebozBXCo2qYhRo.105.woff2]] map[cause:Web font extra:map[type:url value:https://fonts.gstatic.com/s/notosanstc/v39/-nF7OG829Oofr2wohFbTp9iFOisNA_cTyNromxqQuEMQ2wHYwbnmy1R1jDujLebozBXCo2qYhRo.109.woff2]] map[cause:Web font extra:map[type:url value:https://fonts.gstatic.com/s/notosanstc/v39/-nF7OG829Oofr2wohFbTp9iFOisNA_cTyNromxqQuEMQ2wHYwbnmy1R1jDujLebozBXCo2qYhRo.107.woff2]] map[cause:Web font extra:map[type:url value:https://fonts.gstatic.com/s/notosanstc/v39/-nF7OG829Oofr2wohFbTp9iFOisNA_cTyNromxqQuEMQ2wHYwbnmy1R1jDujLebozBXCo2qYhRo.24.woff2]] map[cause:Web font extra:map[type:url value:https://fonts.gstatic.com/s/notosanstc/v39/-nF7OG829Oofr2wohFbTp9iFOisNA_cTyNromxqQuEMQ2wHYwbnmy1R1jDujLebozBXCo2qYhRo.110.woff2]] map[cause:Web font extra:map[type:url value:https://fonts.gstatic.com/s/notosanstc/v39/-nF7OG829Oofr2wohFbTp9iFOisNA_cTyNromxqQuEMQ2wHYwbnmy1R1jDujLebozBXCo2qYhRo.65.woff2]] map[cause:Web font extra:map[type:url value:https://fonts.gstatic.com/s/notosanstc/v39/-nF7OG829Oofr2wohFbTp9iFOisNA_cTyNromxqQuEMQ2wHYwbnmy1R1jDujLebozBXCo2qYhRo.114.woff2]] map[cause:Web font extra:map[type:url value:https://fonts.gstatic.com/s/notosanstc/v39/-nF7OG829Oofr2wohFbTp9iFOisNA_cTyNromxqQuEMQ2wHYwbnmy1R1jDujLebozBXCo2qYhRo.103.woff2]] map[cause:Web font extra:map[type:url value:https://fonts.gstatic.com/s/notosanstc/v39/-nF7OG829Oofr2wohFbTp9iFOisNA_cTyNromxqQuEMQ2wHYwbnmy1R1jDujLebozBXCo2qYhRo.102.woff2]] map[cause:Web font extra:map[type:url value:https://fonts.gstatic.com/s/notosanstc/v39/-nF7OG829Oofr2wohFbTp9iFOisNA_cTyNromxqQuEMQ2wHYwbnmy1R1jDujLebozBXCo2qYhRo.106.woff2]] map[cause:Web font extra:map[type:url value:https://fonts.gstatic.com/s/notosanstc/v39/-nF7OG829Oofr2wohFbTp9iFOisNA_cTyNromxqQuEMQ2wHYwbnmy1R1jDujLebozBXCo2qYhRo.71.woff2]] map[cause:Web font extra:map[type:url value:https://fonts.gstatic.com/s/notosanstc/v39/-nF7OG829Oofr2wohFbTp9iFOisNA_cTyNromxqQuEMQ2wHYwbnmy1R1jDujLebozBXCo2qYhRo.56.woff2]] map[cause:Web font extra:map[type:url value:https://fonts.gstatic.com/s/notosanstc/v39/-nF7OG829Oofr2wohFbTp9iFOisNA_cTyNromxqQuEMQ2wHYwbnmy1R1jDujLebozBXCo2qYhRo.100.woff2]] map[cause:Web font extra:map[type:url value:https://fonts.gstatic.com/s/notosanstc/v39/-nF7OG829Oofr2wohFbTp9iFOisNA_cTyNromxqQuEMQ2wHYwbnmy1R1jDujLebozBXCo2qYhRo.63.woff2]] map[cause:Web font extra:map[type:url value:https://fonts.gstatic.com/s/notosanstc/v39/-nF7OG829Oofr2wohFbTp9iFOisNA_cTyNromxqQuEMQ2wHYwbnmy1R1jDujLebozBXCo2qYhRo.77.woff2]] map[cause:Web font extra:map[type:url value:https://fonts.gstatic.com/s/notosanstc/v39/-nF7OG829Oofr2wohFbTp9iFOisNA_cTyNromxqQuEMQ2wHYwbnmy1R1jDujLebozBXCo2qYhRo.38.woff2]] map[cause:Web font extra:map[type:url value:https://fonts.gstatic.com/s/notosanstc/v39/-nF7OG829Oofr2wohFbTp9iFOisNA_cTyNromxqQuEMQ2wHYwbnmy1R1jDujLebozBXCo2qYhRo.101.woff2]] map[cause:Web font extra:map[type:url value:https://fonts.gstatic.com/s/notosanstc/v39/-nF7OG829Oofr2wohFbTp9iFOisNA_cTyNromxqQuEMQ2wHYwbnmy1R1jDujLebozBXCo2qYhRo.23.woff2]] map[cause:Web font extra:map[type:url value:https://fonts.gstatic.com/s/notosanstc/v39/-nF7OG829Oofr2wohFbTp9iFOisNA_cTyNromxqQuEMQ2wHYwbnmy1R1jDujLebozBXCo2qYhRo.46.woff2]] map[cause:Web font extra:map[type:url value:https://fonts.gstatic.com/s/notosanstc/v39/-nF7OG829Oofr2wohFbTp9iFOisNA_cTyNromxqQuEMQ2wHYwbnmy1R1jDujLebozBXCo2qYhRo.52.woff2]] map[cause:Web font extra:map[type:url value:https://fonts.gstatic.com/s/notosanstc/v39/-nF7OG829Oofr2wohFbTp9iFOisNA_cTyNromxqQuEMQ2wHYwbnmy1R1jDujLebozBXCo2qYhRo.88.woff2]] map[cause:Web font extra:map[type:url value:https://fonts.gstatic.com/s/notosanstc/v39/-nF7OG829Oofr2wohFbTp9iFOisNA_cTyNromxqQuEMQ2wHYwbnmy1R1jDujLebozBXCo2qYhRo.30.woff2]] map[cause:Web font extra:map[type:url value:https://fonts.gstatic.com/s/notosanstc/v39/-nF7OG829Oofr2wohFbTp9iFOisNA_cTyNromxqQuEMQ2wHYwbnmy1R1jDujLebozBXCo2qYhRo.67.woff2]] map[cause:Web font extra:map[type:url value:https://fonts.gstatic.com/s/notosanstc/v39/-nF7OG829Oofr2wohFbTp9iFOisNA_cTyNromxqQuEMQ2wHYwbnmy1R1jDujLebozBXCo2qYhRo.83.woff2]] map[cause:Web font extra:map[type:url value:https://fonts.gstatic.com/s/notosanstc/v39/-nF7OG829Oofr2wohFbTp9iFOisNA_cTyNromxqQuEMQ2wHYwbnmy1R1jDujLebozBXCo2qYhRo.28.woff2]] map[cause:Web font extra:map[type:url value:https://fonts.gstatic.com/s/notosanstc/v39/-nF7OG829Oofr2wohFbTp9iFOisNA_cTyNromxqQuEMQ2wHYwbnmy1R1jDujLebozBXCo2qYhRo.72.woff2]] map[cause:Web font extra:map[type:url value:https://fonts.gstatic.com/s/notosanstc/v39/-nF7OG829Oofr2wohFbTp9iFOisNA_cTyNromxqQuEMQ2wHYwbnmy1R1jDujLebozBXCo2qYhRo.33.woff2]] map[cause:Web font extra:map[type:url value:https://fonts.gstatic.com/s/notosanstc/v39/-nF7OG829Oofr2wohFbTp9iFOisNA_cTyNromxqQuEMQ2wHYwbnmy1R1jDujLebozBXCo2qYhRo.53.woff2]] map[cause:Web font extra:map[type:url value:https://fonts.gstatic.com/s/notosanstc/v39/-nF7OG829Oofr2wohFbTp9iFOisNA_cTyNromxqQuEMQ2wHYwbnmy1R1jDujLebozBXCo2qYhRo.35.woff2]]] type:subitems]] map[node:map[boundingRect:map[bottom:66 height:20 left:1260 right:1280 top:46 width:20] lhId:page-15-::before nodeLabel:div.tools-box__items > div.member-button > i.i-user-not-login > ::before path:1,HTML,1,BODY,9,HEADER,2,DIV,0,SECTION,1,DIV,1,DIV,1,DIV,0,I,0,::before selector:div.tools-box__items > div.member-button > i.i-user-not-login > ::before snippet:<::before> type:node] score:0.001027]]

items: [map[node:map[type:text value:Total] score:0.001064] map[node:map[boundingRect:map[bottom:742 height:543 left:419 right:931 top:199 width:512] lhId:page-25-DIV nodeLabel:UDN.com asks for your consent to use your personal data to: Personalised advert… path:1,HTML,1,BODY,39,DIV,1,DIV selector:body > div.fc-consent-root > div.fc-dialog-container snippet:<div class="fc-dialog-container"> type:node] score:0.001064 subItems:map[items:[map[cause:Web font extra:map[type:url value:https://fonts.gstatic.com/s/opensans/v40/memvYaGs126MiZpBA-UvWbX2vVnXBbObj2OVTS-mu0SC55I.woff2]]] type:subitems]]]

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
/s/opensans/v40/memvYaGs126MiZpBA-UvWbX2vVnXBbObj2OVTS-mu...	25 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:Source valueType:source-location] map[granularity:1 key:reflowTime label:Total reflow time valueType:ms]]

items: [map[reflowTime:1.366 source:map[column:382 line:0 type:source-location url:https://udn.com/static/js/google-dfp-native.js?202604201435 urlProvider:network]] map[reflowTime:125.564 source:map[type:text value:[unattributed]]] map[reflowTime:14.976 source:map[column:155210 line:1 type:source-location url:https://udn.com/static/js/index.bundle.js?202604201435 urlProvider:network]] map[reflowTime:20.105 source:map[column:63325 line:1 type:source-location url:https://udn.com/static/js/index.bundle.js?202604201435 urlProvider:network]] map[reflowTime:105.61 source:map[column:8466 line:1 type:source-location url:https://p.udn.com.tw/upf/static/common/udn-fingerprint.umd.js?12 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.

	URL	Resource Size	Est Savings
a.focus-list > div.focus-list__image > picture > img `a.focus-list > div.focus-list__image > picture > img`	/gw/photo.php?u=https://uc.udn.com.tw/photo/t3/2026/04/17...	193.6 KiB	189.3 KiB
div.story-list__image > a.story-list__image--holder > picture > img `div.story-list__image > a.story-list__image--holder > picture > img`	/gw/photo.php?u=https://uc.udn.com.tw/photo/t3/2026/03/30...	166.1 KiB	156.4 KiB
section.slide-holder > section.slide > div.slide-section > ::after `section.slide-holder > section.slide > div.slide-section > ::after`	udn.com/static/img/udn-loading.png	39.7 KiB	38.1 KiB
section.slide > a.slide-image > picture > img.lazyload `section.slide > a.slide-image > picture > img.lazyload`	/gw/photo.php?u=https://uc.udn.com.tw/photo/t3/2026/04/20...	52.7 KiB	27.7 KiB
div.story-list__image > a.story-list__image--holder > picture > img `div.story-list__image > a.story-list__image--holder > picture > img`	/upfiles/B_ED/EDITOR_RECOMM/PSN_PHOTO/3375/f_RECOMM_15341...	44.9 KiB	19.9 KiB
div.story-list__image > a.story-list__image--holder > picture > img `div.story-list__image > a.story-list__image--holder > picture > img`	/gw/photo.php?u=https://p.udn.com.tw/upf/2014_banners/hyp...	26.1 KiB	16.3 KiB
div.story-list__image > a.story-list__image--holder > picture > img `div.story-list__image > a.story-list__image--holder > picture > img`	/gw/photo.php?u=https://uc.udn.com.tw/photo/t3/2026/04/20...	20.7 KiB	11.0 KiB
div.story-list__image > a.story-list__image--holder > picture > img `div.story-list__image > a.story-list__image--holder > picture > img`	/gw/photo.php?u=https://uc.udn.com.tw/photo/t3/2026/04/21...	20.6 KiB	10.9 KiB
section.slide > a.slide-image > picture > img.lazyload `section.slide > a.slide-image > picture > img.lazyload`	/gw/photo.php?u=/photo/t3/2026/04/20/34871775.jpg&M=2&x=&...	32.8 KiB	7.8 KiB
a.focus-list > div.focus-list__image > picture > img `a.focus-list > div.focus-list__image > picture > img`	/gw/photo.php?u=https://uc.udn.com.tw/photo/t3/2026/03/30...	17.2 KiB	7.6 KiB
div.story-list__image > a.story-list__image--holder > picture > img `div.story-list__image > a.story-list__image--holder > picture > img`	/gw/photo.php?u=https://uc.udn.com.tw/photo/t3/2026/04/21...	16.9 KiB	7.2 KiB
div.story-list__image > a.story-list__image--holder > picture > img `div.story-list__image > a.story-list__image--holder > picture > img`	/gw/photo.php?u=https://uc.udn.com.tw/photo/t3/2026/04/13...	15.6 KiB	5.9 KiB
div.story-list__image > a.story-list__image--holder > picture > img `div.story-list__image > a.story-list__image--holder > picture > img`	/gw/photo.php?u=https://uc.udn.com.tw/photo/t3/2026/04/21...	13.3 KiB	4.6 KiB
a.focus-list > div.focus-list__image > picture > img `a.focus-list > div.focus-list__image > picture > img`	/gw/photo.php?u=https://uc.udn.com.tw/photo/t3/2026/04/20...	14.2 KiB	4.5 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-14-IMG

nodeLabel: div.slide-section > a.slide-image > picture > img.lazyload

path: 1,HTML,1,BODY,12,MAIN,0,DIV,6,SECTION,7,DIV,0,SECTION,0,SECTION,0,DIV,0,A,0,PICTURE,4,IMG

selector: div.slide-section > a.slide-image > picture > img.lazyload

snippet: <img src="https://pgw.udn.com.tw/gw/photo.php?u=https://uc.udn.com.tw/photo/t3/2026/…" loading="lazy" alt="" class="lazyload">

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

value: no origins were preconnected

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.

URL	Transfer Size	Duration
s.udn.com.tw/static/font-icons/css/animation.css?202604201435	2.6 KiB	312 ms
s.udn.com.tw/static/font-icons/css/fontello.css?202604201435	11.4 KiB	312 ms
udn.com/static/css/index.css?202604201435	29.9 KiB	80 ms
udn.com/static/js/utils_head.bundle.js?202604201435	3.0 KiB
udn.com/static/js/google-dfp-native.js?202604201435	5.0 KiB
udn.com/upf/static/common/md5.js?1	2.3 KiB
udn.com/static/js/vendor_head.bundle.js?202604201435	1.1 KiB
udn.com/static/css/google-dfp-native.css?202604201435	2.2 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: 212 ms

URL	Time Spent
udn.com/	212 ms
udn.com/news/index	0.0 ms

These are the largest layout shifts observed on the page. Each table item represents a single layout shift, and shows the element that shifted the most. Below each item are possible root causes that led to the layout shift. Some of these layout shifts may not be included in the CLS metric value due to windowing. Learn how to improve CLS

Why this matters

Performance issues directly impact user engagement and conversion rates.

Element	Layout shift score
庫克交棒硬體大將特納斯 9月接掌蘋果CEO `div.slide-section > div.slide-links > h2 > a`	0.094
接棒庫克游泳冠軍特納斯要延續傳奇故事 `div.slide-links > div.slide-divider > h3 > a`	0.029
UDN.com asks for your consent to use your personal data to: Personalised advert… `body > div.fc-consent-root > div.fc-dialog-container`	0.001
div.tools-box__items > div.member-button > i.i-user-not-login > ::before `div.tools-box__items > div.member-button > i.i-user-not-login > ::before`	0.001

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

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 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: 100 ms 850.3 KiB

URL	Transfer Size	Est Savings
cdn.taboola.com/libtrc/udntw-udndesktop/loader.js	316.8 KiB	226.1 KiB
/pagead/managed/js/gpt/m202604160201/pubads_impl.js	187.7 KiB	127.7 KiB
www.googletagmanager.com/gtag/js?id=G-7THXRBK2CK&cx=c&gtm=4e64h1	164.3 KiB	66.5 KiB
www.googletagmanager.com/gtag/js?id=G-NEBRGBLTFZ&cx=c&gtm=4e64h1	145.0 KiB	62.9 KiB
www.googletagmanager.com/gtm.js?id=GTM-NVJVL2N	141.2 KiB	60.0 KiB
www.googletagmanager.com/gtm.js?id=GTM-5CMHR66	151.7 KiB	57.0 KiB
connect.facebook.net/zh_TW/bundle/sdk.js/	77.8 KiB	53.8 KiB
udn.com/static/js/vendor.bundle.js?202604201435	85.7 KiB	46.9 KiB
fundingchoicesmessages.google.com/i/103512698?ers=3	68.8 KiB	36.4 KiB
p.udn.com.tw/upf/static/common/prebid4.35.0_20210415.js	70.4 KiB	35.3 KiB
connect.facebook.net/en_US/fbevents.js	96.5 KiB	33.6 KiB
static.criteo.net/js/ld/publishertag.prebid.js	31.0 KiB	23.5 KiB
udn.com/static/js/index.bundle.js?202604201435	29.6 KiB	20.3 KiB

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

Category	Time Spent
Script Evaluation	1.2 s
Style & Layout	989 ms
Other	444 ms
Rendering	188 ms
Script Parsing & Compilation	156 ms
Parse HTML & CSS	46 ms
Garbage Collection	21 ms

Minifying CSS files can reduce network payload sizes. Learn how to minify CSS.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 0.0 ms 10.3 KiB

URL	Transfer Size	Est Savings
/css?family=Noto+Sans+TC:300,400,500&display=swap&subset=...	98.1 KiB	10.3 KiB

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 16.1 KiB

URL	Transfer Size	Est Savings
www.gstatic.com/firebasejs/10.13.1/firebase-app.js	22.2 KiB	13.1 KiB
p.udn.com.tw/upf/static/common/recommendation/recommendation-system.js	7.5 KiB	3.0 KiB

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 133.0 KiB

URL	Transfer Size	Est Savings
/css?family=Noto+Sans+TC:300,400,500&display=swap&subset=...	97.6 KiB	97.6 KiB
udn.com/static/css/index.css?202604201435	29.7 KiB	21.4 KiB
.fc-consent-root .fc-dialog-container.fc-fullscreen { height: 100% !important; … } …	16.2 KiB	14.0 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.

URL	Transfer Size
cdn.taboola.com/libtrc/udntw-udndesktop/loader.js	317.4 KiB
/gw/photo.php?u=https://uc.udn.com.tw/photo/t3/2026/04/17...	193.8 KiB
/pagead/managed/js/gpt/m202604160201/pubads_impl.js	187.7 KiB
/gw/photo.php?u=https://uc.udn.com.tw/photo/t3/2026/03/30...	166.4 KiB
www.googletagmanager.com/gtag/js?id=G-7THXRBK2CK&cx=c&gtm=4e64h1	164.3 KiB
www.googletagmanager.com/gtm.js?id=GTM-5CMHR66	152.1 KiB
www.googletagmanager.com/gtag/js?id=G-NEBRGBLTFZ&cx=c&gtm=4e64h1	145.0 KiB
www.googletagmanager.com/gtm.js?id=GTM-NVJVL2N	141.3 KiB
udn.com/upf/static/common/vote/vote-default-1.jpg	111.8 KiB
/css?family=Noto+Sans+TC:300,400,500&display=swap&subset=...	98.1 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
section.weather-wrapper > a.udn-weather__widget > div.weather-info > img.weather-icon `section.weather-wrapper > a.udn-weather__widget > div.weather-info > img.weather-icon`	udn.com/static/img/weather/001.svg

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

●Document request latency

●Optimize DOM size

●LCP breakdown

●Modern HTTP

●Optimize viewport for mobile

●User Timing marks and measures 12 user timings

●JavaScript execution time 1.1 s

●Avoid long main-thread tasks 11 long tasks found

●Avoid non-composited animations 3 animated elements found

●Page didn't prevent back/forward cache restoration

●Network Requests

●Network Round Trip Times 280 ms

●Server Backend Latencies 300 ms

●Tasks

●Diagnostics

●Metrics

●Screenshot Thumbnails

●Final Screenshot

●Script Treemap Data

●Resources Summary

●Initial server response time was short Root document took 10 ms

○INP breakdown

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

Some ARIA parent roles must contain specific child roles to perform their intended accessibility functions. Learn more about roles and required children elements.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
即時熱門 07:09 獨家專訪／不怕日股下市創新高！東證社長橫山隆介：公司素質更重要 07:00 中職／富邦養兵多年未果台鋼招兵買馬可望挑戰三本柱 07:… `main.main-content > div.container > section.main-index__focus > div.udn-tab`

When an element doesn't have an accessible name, screen readers announce it with a generic name, making it unusable for users who rely on screen readers. Learn how to make command elements more accessible.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
div.udn-slider > section.slider-controls > section.slider-dot > span `div.udn-slider > section.slider-controls > section.slider-dot > span`

When a `progressbar` element doesn't have an accessible name, screen readers announce it with a generic name, making it unusable for users who rely on screen readers. Learn how to label `progressbar` elements.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
div.context-box__content > section.udn-vote__body > div.udn-vote__list > span.udn-vote__progress `div.context-box__content > section.udn-vote__body > div.udn-vote__list > span.udn-vote__progress`
div.context-box__content > section.udn-vote__body > div.udn-vote__list > span.udn-vote__progress `div.context-box__content > section.udn-vote__body > div.udn-vote__list > span.udn-vote__progress`
div.context-box__content > section.udn-vote__body > div.udn-vote__list > span.udn-vote__progress `div.context-box__content > section.udn-vote__body > div.udn-vote__list > span.udn-vote__progress`

Using ARIA attributes in roles where they are prohibited can mean that important information is not communicated to users of assistive technologies. Learn more about prohibited ARIA roles.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
submit-search `section.overlay-menu > div.container > div.input-holder > span.btn`

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.

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
河好如初 `section.header-wrapper > div.tools-box > nav.channel-link > a`
有設計 `section.header-wrapper > div.tools-box > nav.channel-link > a`
有行旅 `section.header-wrapper > div.tools-box > nav.channel-link > a`
願景 `section.header-wrapper > div.tools-box > nav.channel-link > a`
我的新聞 `section.header-wrapper > div.tools-box > nav.channel-link > a`
大甲媽祖 `div.container > section.navigation-wrapper > nav.navigation > a.navigation-list`
美伊戰事 `div.container > section.navigation-wrapper > nav.navigation > a.navigation-list`
快訊 `main.main-content > div.container > section.breaking-news__wrapper > div.breaking-news__icon`
06:36 `section.breaking-news__wrapper > h2.breaking-news > a > time.breaking-news__time`
熱門 `header.context-box__header > div.context-box__header__wrap > h3.context-box__title > a.udn-tab__title`
07:09 `div.context-box > div.context-box__content > a.tab-link > span.tab-link__note`
07:00 `div.context-box > div.context-box__content > a.tab-link > span.tab-link__note`
07:00 `div.context-box > div.context-box__content > a.tab-link > span.tab-link__note`
07:00 `div.context-box > div.context-box__content > a.tab-link > span.tab-link__note`
07:00 `div.context-box > div.context-box__content > a.tab-link > span.tab-link__note`
07:00 `div.context-box > div.context-box__content > a.tab-link > span.tab-link__note`
06:55 `div.context-box > div.context-box__content > a.tab-link > span.tab-link__note`
行情 `div.context-box__content > section.keywords-wrapper > section.keywords > a.btn`
發票 `div.context-box__content > section.keywords-wrapper > section.keywords > a.btn`
樂透 `div.context-box__content > section.keywords-wrapper > section.keywords > a.btn`
空氣品質 `section.weather-wrapper > a.udn-weather__widget > div.udn-weather__aqi > span.aqi-word`
AQI 53 `section.weather-wrapper > a.udn-weather__widget > div.udn-weather__aqi > span.aqi-value`
53 `a.udn-weather__widget > div.udn-weather__aqi > span.aqi-value > span`
「鄭習會」後，中國大陸提出十項對台措施，綠營原先預期，「鄭習會」加深國民黨親中標籤，有機會成為年底地方選舉，藍綠氣勢消長的轉捩點，民進黨立委王世堅更說「國民黨… `section.slide > div.slide-info > a.context-box__content > p`
52% `section.udn-vote__body > div.udn-vote__list > span.udn-vote__count > span.udn-vote__percent`
21% `section.udn-vote__body > div.udn-vote__list > span.udn-vote__count > span.udn-vote__percent`
15% `section.udn-vote__body > div.udn-vote__list > span.udn-vote__count > span.udn-vote__percent`
訂閱 `div.container > section.footer-social > form.newsletter > button.btn`
Learn more `div.fc-dialog-content > div.fc-dialog-scrollable-content > button.fc-faq-header > span.fc-faq-label`
List of partners. `div.fc-dialog-scrollable-content > div.fc-footer > p > a.fc-vendors-list-dialog`

These are opportunities to improve the legibility of your content.

Names and labels

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
section.header-wrapper > div.logo > a > img `section.header-wrapper > div.logo > a > img`
section.header-wrapper > div.logo > a > img `section.header-wrapper > div.logo > a > img`

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.context-box__content > div.feature-guess__list > div.story-list__image > a.story-list__image--holder `div.context-box__content > div.feature-guess__list > div.story-list__image > a.story-list__image--holder`
div.feature-guess__list > div.story-list__text > h3 > a `div.feature-guess__list > div.story-list__text > h3 > a`
div.context-box__content > div.feature-guess__list > div.story-list__image > a.story-list__image--holder `div.context-box__content > div.feature-guess__list > div.story-list__image > a.story-list__image--holder`
div.feature-guess__list > div.story-list__text > h3 > a `div.feature-guess__list > div.story-list__text > h3 > a`
div.context-box__content > div.feature-guess__list > div.story-list__image > a.story-list__image--holder `div.context-box__content > div.feature-guess__list > div.story-list__image > a.story-list__image--holder`
div.feature-guess__list > div.story-list__text > h3 > a `div.feature-guess__list > div.story-list__text > h3 > a`
div.context-box__content > div.feature-guess__list > div.story-list__image > a.story-list__image--holder `div.context-box__content > div.feature-guess__list > div.story-list__image > a.story-list__image--holder`
div.feature-guess__list > div.story-list__text > h3 > a `div.feature-guess__list > div.story-list__text > h3 > a`
div.context-box__content > div.feature-guess__list > div.story-list__image > a.story-list__image--holder `div.context-box__content > div.feature-guess__list > div.story-list__image > a.story-list__image--holder`
div.feature-guess__list > div.story-list__text > h3 > a `div.feature-guess__list > div.story-list__text > h3 > a`
div.context-box__content > div.feature-guess__list > div.story-list__image > a.story-list__image--holder `div.context-box__content > div.feature-guess__list > div.story-list__image > a.story-list__image--holder`
div.feature-guess__list > div.story-list__text > h3 > a `div.feature-guess__list > div.story-list__text > h3 > a`
section.slide > div.slide-info > header.context-box__header > a.btn `section.slide > div.slide-info > header.context-box__header > a.btn`
section.slide > div.slide-info > header.context-box__header > a.btn `section.slide > div.slide-info > header.context-box__header > a.btn`
section.slide > div.slide-info > header.context-box__header > a.btn `section.slide > div.slide-info > header.context-box__header > a.btn`
section.slide > div.slide-info > header.context-box__header > a.btn `section.slide > div.slide-info > header.context-box__header > a.btn`
section.secondary-content__items > div.udn-vote > header.context-box__header > a.btn `section.secondary-content__items > div.udn-vote > header.context-box__header > a.btn`
section.secondary-content__items > div.market-news > header.context-box__header > a.btn `section.secondary-content__items > div.market-news > header.context-box__header > a.btn`
div.container > div.context-box > header.context-box__header > a.btn `div.container > div.context-box > header.context-box__header > a.btn`
div.story-list__holder > div.story-list__news > div.story-list__image > a.story-list__image--holder `div.story-list__holder > div.story-list__news > div.story-list__image > a.story-list__image--holder`
footer.footer > div.container > section.footer-social > a.btn `footer.footer > div.container > section.footer-social > a.btn`
footer.footer > div.container > section.footer-social > a.btn `footer.footer > div.container > section.footer-social > a.btn`
footer.footer > div.container > section.footer-social > a.btn `footer.footer > div.container > section.footer-social > a.btn`
footer.footer > div.container > section.footer-social > a.btn `footer.footer > div.container > section.footer-social > a.btn`
footer.footer > div.container > section.footer-social > a.btn `footer.footer > div.container > section.footer-social > a.btn`

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.

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
訂閱 `div.container > section.footer-social > form.newsletter > button.btn`

○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]`s are contained by their required parent element

●`[role]` values are valid

●`[aria-*]` attributes have valid values

●`[aria-*]` attributes are valid and not misspelled

●Buttons have an accessible name

●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.

●ARIA attributes are used as specified for the element's role

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

●`[aria-hidden="true"]` elements do not contain focusable descendents

●Document has a `<title>` element

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

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

●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

●Document has a main landmark.

●Deprecated ARIA roles were not used

●All heading elements contain content.

●Uses ARIA roles only on compatible elements

●Identical links have the same purpose.

○`[accesskey]` values are unique

○ARIA input fields have accessible names

○ARIA `meter` elements have accessible names

○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

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

○`<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

○Links are distinguishable without relying on color.

○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>`.

○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.

Best Practices

Trust and Safety

Users are mistrustful of or confused by sites that request their location without context. Consider tying the request to a user action instead. Learn more about the geolocation permission.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Source
udn.com/static/js/index.bundle.js?202604201435 line 1, col 84345

Users are mistrustful of or confused by sites that request to send notifications without context. Consider tying the request to user gestures instead. Learn more about responsibly getting permission for notifications.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Source
udn.com/static/js/firebase.js?t=2025010202 line 34, col 13

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 / Warning	Source
AttributionReporting	connect.facebook.net/en_US/fbevents.js line 279, col 769
Specifying overflow: visible on img, video and canvas tags may cause them to produce visual content outside of the element bounds. See https://github.com/WICG/shared-element-transitions/blob/main/debugging_overflow_on_images.md.	/_/mss/boq-content-ads-contributor/_/js/k=boq-content-ads... line 19, col 449

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.

Source	Description
p.udn.com.tw/upf/static/common/prebid4.35.0_20210415.js line 3, col 13853	`%cPrebid display: inline-block; color: #fff; background: #3b88c3; padding: 1px 4px; border-radius: 3px; ERROR: in response for appnexus adapter: Could not find valid member in request`
p.udn.com.tw/upf/static/common/prebid4.35.0_20210415.js line 3, col 13853	`%cPrebid display: inline-block; color: #fff; background: #3b88c3; padding: 1px 4px; border-radius: 3px; ERROR: Server call for aol failed: . Continuing without bids.`
p.udn.com.tw/upf/static/common/prebid4.35.0_20210415.js line 3, col 13853	`%cPrebid display: inline-block; color: #fff; background: #3b88c3; padding: 1px 4px; border-radius: 3px; ERROR: Server call for aol failed: . Continuing without bids.`
p.udn.com.tw/upf/static/common/prebid4.35.0_20210415.js line 3, col 13853	`%cPrebid display: inline-block; color: #fff; background: #3b88c3; padding: 1px 4px; border-radius: 3px; ERROR: Server call for aol failed: . Continuing without bids.`
p.udn.com.tw/upf/static/common/prebid4.35.0_20210415.js line 3, col 13853	`%cPrebid display: inline-block; color: #fff; background: #3b88c3; padding: 1px 4px; border-radius: 3px; ERROR: Server call for openx failed: . Continuing without bids.`
udn.com/news/index	`Access to XMLHttpRequest at 'https://c2shb.ssp.yahoo.com/bidRequest?dcn=8a969162017373e3f4b2fb08e6a00704&pos=udn_pc_right2_300x250_display_hb&cmd=bid&secure=1' from origin 'https://udn.com' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.`
udn.com/news/index	`Access to XMLHttpRequest at 'https://c2shb.ssp.yahoo.com/bidRequest?dcn=8a969162017373e3f4b2fb08e6a00704&pos=udn_pc_right3_300x250_display_hb&cmd=bid&secure=1' from origin 'https://udn.com' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.`
udn.com/news/index	`Access to XMLHttpRequest at 'https://c2shb.ssp.yahoo.com/bidRequest?dcn=8a969162017373e3f4b2fb08e6a00704&pos=udn_pc_right4_300x250_display_hb&cmd=bid&secure=1' from origin 'https://udn.com' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.`
udn.com/news/index	Access to XMLHttpRequest at 'https://udn-usd-d.openx.net/w/1.0/arj?ju=https%3A%2F%2Fudn.com%2Fnews%2Findex&ch=UTF-8&res=800x600x24&ifr=false&tz=0&tws=1350x940&be=1&bc=hb_pb_3.0.3&dddid=59d3a09b-51ba-4df8-b1f1-2a670a2ca669%2Cb7ebb4be-4fde-4e3b-ae4a-e8575ab2c4da%2C23c87a1b-83b0-4c03-8f50-ab90e5548d9b&nocache=1776813072330&aus=300x250%7C300x250%7C300x250&divIds=ads-recommendation-300x250%2Cads-300x250-1%2Cads-300x250-2&auid=541147525%2C541052419%2C541052420' from origin 'https://udn.com' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.
/w/1.0/arj?ju=https%3A%2F%2Fudn.com%2Fnews%2Findex&ch=UTF...	`Failed to load resource: net::ERR_FAILED`
/bidRequest?dcn=8a969162017373e3f4b2fb08e6a00704&pos=udn_...	`Failed to load resource: net::ERR_FAILED`
/bidRequest?dcn=8a969162017373e3f4b2fb08e6a00704&pos=udn_...	`Failed to load resource: net::ERR_FAILED`
/bidRequest?dcn=8a969162017373e3f4b2fb08e6a00704&pos=udn_...	`Failed to load resource: net::ERR_FAILED`
udn.com/news/index line 176, col 15	`TypeError: Cannot read properties of undefined (reading 'split') at https://udn.com/news/index:177:16`

●Uses HTTPS

●Avoids third-party cookies

●Allows users to paste into input fields

●Displays images with correct aspect ratio

●Serves images with appropriate resolution

●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 clickjacking with XFO or CSP

●Mitigate DOM-based XSS with Trusted Types

●Detected JavaScript libraries

●Page has valid source maps

○Redirects HTTP traffic to HTTPS

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
section.header-wrapper > div.logo > a > img `section.header-wrapper > div.logo > a > img`
section.header-wrapper > div.logo > a > img `section.header-wrapper > div.logo > a > 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`