https://cas.cn
Accessibility
· 13 checks — Landmarks, headings, alt text, forms, and link quality rolled into one auditable list.SCORE
37
GRADE
F
FIX
10
REVIEW
3
PASS
0
INFO
0
Checks
133 REVIEW 10 FIX
DLandmark StructureActionNo landmarksFIX
Landmark Structure
ActionNo landmarks
No landmarks
Critical::
No <main> landmark found
Screen reader users cannot quickly navigate to the primary content. Wrap your main content in <main>.
Warning::
No <nav> landmark found
Info::
No banner (header) landmark
Info::
No contentinfo (footer) landmark
Warning::
Skip navigation link is missing (WCAG 2.4.1)
Add a skip link as the first focusable element so keyboard users can bypass repeated navigation.
No landmarks detected
Screen reader users have no way to navigate by region.
Screen reader users cannot quickly navigate to the primary content. Wrap your main content in <main>.
Why this matters
Without a <main> landmark, screen-reader users can't skip past the navigation to the page content — every page starts with re-reading the menu.
Learn more ▾ ▴
The <main> element marks the page's primary content area. Assistive tech offers a 'jump to main' shortcut — but only if <main> exists. Without it, every page navigation forces re-reading the header. Wrap your primary content in a single <main>.
Source: WAI-ARIA / WCAG 2.4.1
Add a skip link as the first focusable element so keyboard users can bypass repeated navigation.
Why this matters
Without a skip-nav link, keyboard users tab through every nav item before reaching content — every page, every visit.
Learn more ▾ ▴
WCAG 2.4.1 (Bypass Blocks) requires a mechanism to skip past repeated content. The standard implementation is a 'Skip to main content' link that's the first focusable element, visually hidden until focused. Three lines of HTML + four of CSS.
Source: WCAG 2.1 SC 2.4.1
FAlt Text QualityAction122 of 123 images have issuesFIX
Alt Text Quality
Action122 of 123 images have issues
122 of 123 images have issues
Critical::
122 image(s) missing alt attribute
Images without alt text are invisible to screen readers.
Critical::
106 image-in-link without alt text
An image inside a link with no alt creates an empty link.
Info::
1 decorative image(s) correctly marked
123 images 1 decorative 122 missing
| Issue | Count |
|---|---|
| missing | 122 image(s) |
Images without alt text are invisible to screen readers.
Why this matters
Each image without alt text is a WCAG 1.1.1 failure — invisible to screen-reader users, lost from Google Image Search.
Learn more ▾ ▴
WCAG 2.1 Level A requires text alternatives for non-decorative images. Empty alt='' is fine for decorative; meaningful images need descriptive text. Common fixes: CMS audit + bulk add, build-time linter (alt-text-required ESLint rule), CI gate on Lighthouse a11y score.
Source: WCAG 2.1 SC 1.1.1 / WebAIM Million Report
An image inside a link with no alt creates an empty link.
Why this matters
Image-only links with no alt create empty links — screen-reader users hear 'link' with no destination context.
Learn more ▾ ▴
An <a><img></a> with no img alt is the worst-case for accessibility: AT announces the link but can't describe where it goes. Either add alt to the image OR add aria-label to the link.
Source: WCAG 2.1 SC 2.4.4
FForm AccessibilityAction11 of 13 controls have issuesFIX
Form Accessibility
Action11 of 13 controls have issues
11 of 13 controls have issues
Critical::
9 control(s) without accessible label
Form controls need a <label>, aria-label, or aria-labelledby for screen readers.
Got: <input type="button" id="sub-pc">; <input type="submit" id="sub-mobile">; <select>; <select>; <select>; <select>; <select>; <select>; <input type="button" id="na_bt1">
Warning::
2 control(s) rely on placeholder only
Placeholder text disappears on focus and is not a reliable label.
Got: <input type="text" name="iptSword" id="searchword">; <input type="text" id="iptSword">
Info::
2 control(s) properly labeled
13 controls
2 labeled
2 placeholder only
9 unlabeled
| Control | Type | Label | Method |
|---|---|---|---|
| #zwlj_bt1 | button | 是,按回车键在新窗口打开链接 | aria-label |
| #zwlj_bt2 | button | 否,按回车键关闭提示框 | aria-label |
| #searchword | text | (搜索) | placeholder only |
| #iptSword | text | (搜索) | placeholder only |
| select | select | (none) | none |
| select | select | (none) | none |
| select | select | (none) | none |
| select | select | (none) | none |
| select | select | (none) | none |
| select | select | (none) | none |
| #sub-pc | button | (none) | none |
| #sub-mobile | submit | (none) | none |
| #na_bt1 | button | (none) | none |
Form controls need a <label>, aria-label, or aria-labelledby for screen readers.
<input type="button" id="sub-pc">; <input type="submit" id="sub-mobile">; <select>; <select>; <select>; <select>; <select>; <select>; <input type="button" id="na_bt1">
Why this matters
Form controls without labels — assistive tech announces 'edit text' with no context; users can't complete forms.
Source: WCAG 2.1 SC 3.3.2
Placeholder text disappears on focus and is not a reliable label.
<input type="text" name="iptSword" id="searchword">; <input type="text" id="iptSword">
Why this matters
Placeholder-only labels disappear when the user starts typing — they must remember what the field was for.
Learn more ▾ ▴
Placeholders are NOT labels. They vanish on input, fail color contrast checks (most are gray), and don't satisfy WCAG SC 3.3.2. Always use a real <label> alongside (or aria-labelledby).
Source: WCAG 2.1 SC 3.3.2 / Nielsen Norman
FLink & Button QualityAction50 issue(s) across 444 links and 5 buttonsFIX
Link & Button Quality
Action50 issue(s) across 444 links and 5 buttons
50 issue(s) across 444 links and 5 buttons
Critical::
48 link(s) with no accessible text
Links without text are announced as raw URLs by screen readers.
Got: //www.cas.cn/; #; http://english.cas.cn; javascript:void(0);; #; #; https://www.cas.cn/redirect/prp/xlcd/; http://www.casip.ac.cn/; //www.ustc.edu.cn/; //www.ucas.ac.cn/ (+38 more)
Critical::
50 image-only link(s) without alt text
Image-only links need alt text on the image (or aria-label on the link) so screen readers can announce them.
Got: a[href="//www.cas.cn/houjianguo/"]; a[href="//www.cas.cn/wuzhaohui/"]; a[href="//www.cas.cn/sunyegang/"]; a[href="//www.cas.cn/zhouqi/"]; a[href="//www.cas.cn/wangkeqiang/"]; a[href="//www.cas.cn/dingchibiao/"]; a[href="//www.cas.cn/hehongping/"]; a[href="//www.cas.cn/sunxiaoming/"]; a[href="//www.cas.cn/wanghua/"]; a[href="//www.cas.cn/wenya/"] (+40 more)
Warning::
224 link(s) open in new tab without warning
Add '(opens in new tab)' to link text or aria-label.
Got: http://english.cas.cn; //mail.cstnet.cn/; //www.cas.cn/../../kxyj/kjzx/; http://www.casip.ac.cn/; //www.cas.cn/../../rcjy/zkyjyjj/; //www.cas.cn/../../rcjy/zkd/; //www.cas.cn/../../rcjy/gkd/; //www.cas.cn/../../rcjy/skd/; http://www.casad.cas.cn/; http://scicn.casad.cas.cn/ (+214 more)
Critical::
2 button(s) with no accessible text
Icon-only buttons need an aria-label so screen readers can announce them.
Got: input[type="button"]#sub-pc; input[type="submit"]#sub-mobile
Info::
122 link(s) with descriptive text
444 links
48 empty
0 generic text
224 new tab
2 empty buttons
| Element | Text | Issue | Suggested Fix |
|---|---|---|---|
| http://english.cas.cn | English | new tab | Add '(opens in new tab)' to text |
| //mail.cstnet.cn/ | 邮箱 | new tab | Add '(opens in new tab)' to text |
| //www.cas.cn/ | (empty) | empty | Add link text or aria-label |
| # | (empty) | empty | Add link text or aria-label |
| http://english.cas.cn | (empty) | empty | Add link text or aria-label |
| javascript:void(0); | (empty) | empty | Add link text or aria-label |
| # | (empty) | empty | Add link text or aria-label |
| # | (empty) | empty | Add link text or aria-label |
| //www.cas.cn/../../kxyj/kjzx/ | 科技专项 | new tab | Add '(opens in new tab)' to text |
| http://www.casip.ac.cn/ | 知识产权与科技成果转… | new tab | Add '(opens in new tab)' to text |
| //www.cas.cn/../../rcjy/zkyjyjj/ | 中国科学院教育简介 | new tab | Add '(opens in new tab)' to text |
| //www.cas.cn/../../rcjy/zkd/ | 中国科学技术大学 | new tab | Add '(opens in new tab)' to text |
| //www.cas.cn/../../rcjy/gkd/ | 中国科学院大学 | new tab | Add '(opens in new tab)' to text |
| //www.cas.cn/../../rcjy/skd/ | 上海科技大学 | new tab | Add '(opens in new tab)' to text |
| http://www.casad.cas.cn/ | 学部与院士 | new tab | Add '(opens in new tab)' to text |
| http://scicn.casad.cas.cn/ | 科学与中国 | new tab | Add '(opens in new tab)' to text |
| http://www.kepu.cn/ | 中国科普博览 | new tab | Add '(opens in new tab)' to text |
| //www.cas.cn/../../xxgkml/xxgkgzxx/xggd/… | 信息公开指南 | new tab | Add '(opens in new tab)' to text |
| //www.cas.cn/../../xxgkml/xxgkgzxx/xggd/… | 信息公开目录 | new tab | Add '(opens in new tab)' to text |
| //www.cas.cn/../../xxgkml/xxgksq/ | 信息公开申请 | new tab | Add '(opens in new tab)' to text |
| //www.cas.cn/../../xxgkml/xxgklxfs/ | 信息公开联系方式 | new tab | Add '(opens in new tab)' to text |
| http://www.casad.cas.cn/ | 学部与院士 | new tab | Add '(opens in new tab)' to text |
| //www.cas.cn/../../zz/zyze/202511/t20251… | 更多+ | new tab | Add '(opens in new tab)' to text |
| //www.cas.cn/../../zz/yk/202511/t2025110… | 更多+ | new tab | Add '(opens in new tab)' to text |
| //www.cas.cn/houjianguo/ | 侯建国 | img no alt | Add alt attribute to the image |
| //www.cas.cn/wuzhaohui/ | 吴朝晖 | img no alt | Add alt attribute to the image |
| //www.cas.cn/sunyegang/ | 孙也刚 | img no alt | Add alt attribute to the image |
| //www.cas.cn/zhouqi/ | 周 琪 | img no alt | Add alt attribute to the image |
| //www.cas.cn/wangkeqiang/ | 汪克强 | img no alt | Add alt attribute to the image |
| //www.cas.cn/dingchibiao/ | 丁赤飚 | img no alt | Add alt attribute to the image |
| //www.cas.cn/hehongping/ | 何宏平 | img no alt | Add alt attribute to the image |
| //www.cas.cn/sunxiaoming/ | 孙晓明 | img no alt | Add alt attribute to the image |
| //www.cas.cn/wanghua/ | 王 华 | img no alt | Add alt attribute to the image |
| //www.cas.cn/wenya/ | 文 亚 | img no alt | Add alt attribute to the image |
| //www.cas.cn/wangdatong/ | 王大同 | img no alt | Add alt attribute to the image |
| https://go.cas.cn/ | 办公厅 | new tab | Add '(opens in new tab)' to text |
| https://bdp.cas.cn/ | 科技创新发展局 | new tab | Add '(opens in new tab)' to text |
| https://bfse.cas.cn/ | 基础科学研究局 | new tab | Add '(opens in new tab)' to text |
| https://bmrdp.cas.cn/ | 战略高技术研究局 | new tab | Add '(opens in new tab)' to text |
| https://zdzx.cas.cn/ | 重大专项研究局 | new tab | Add '(opens in new tab)' to text |
| https://sdr.cas.cn/ | 可持续发展科技研究局 | new tab | Add '(opens in new tab)' to text |
| https://bsc.cas.cn/ | 科技基础能力局 | new tab | Add '(opens in new tab)' to text |
| https://casad.cas.cn/ | 学部工作局 | new tab | Add '(opens in new tab)' to text |
| https://pe.cas.cn/ | 人才与人事局 | new tab | Add '(opens in new tab)' to text |
| https://bic.cas.cn/ | 国际合作局 | new tab | Add '(opens in new tab)' to text |
| https://bpf.cas.cn/ | 财务与资产管理局 | new tab | Add '(opens in new tab)' to text |
| https://jianshen.cas.cn/ | 审计与监督局（党组巡… | new tab | Add '(opens in new tab)' to text |
| https://jgdw.cas.cn/ | 机关党委 | new tab | Add '(opens in new tab)' to text |
| https://lt.cas.cn/ | 老专家老干部服务局 | new tab | Add '(opens in new tab)' to text |
| https://jijianzu.cas.cn/ | 中央纪委国家监委驻中… | new tab | Add '(opens in new tab)' to text |
| https://syb.cas.cn/ | 沈阳分院 | new tab | Add '(opens in new tab)' to text |
| https://shb.cas.cn/ | 上海分院 | new tab | Add '(opens in new tab)' to text |
| https://whb.cas.cn | 武汉分院 | new tab | Add '(opens in new tab)' to text |
| https://gzb.cas.cn | 广州分院 | new tab | Add '(opens in new tab)' to text |
| https://cdb.cas.cn | 成都分院 | new tab | Add '(opens in new tab)' to text |
| https://kmb.cas.cn | 昆明分院 | new tab | Add '(opens in new tab)' to text |
| https://xab.cas.cn | 西安分院 | new tab | Add '(opens in new tab)' to text |
| https://lzb.cas.cn | 兰州分院 | new tab | Add '(opens in new tab)' to text |
| https://xjb.cas.cn | 新疆分院 | new tab | Add '(opens in new tab)' to text |
| https://lssf.cas.cn/ | 重大科技基础设施 | new tab | Add '(opens in new tab)' to text |
| //www.cas.cn/../../kxyj/202512/t20251218… | 国家科技资源共享服务… | new tab | Add '(opens in new tab)' to text |
| //www.cas.cn//kxyj/kj/zg/ | 国家最高科学技术奖 | new tab | Add '(opens in new tab)' to text |
| //www.cas.cn//kxyj/kj/zr/ | 国家自然科学奖 | new tab | Add '(opens in new tab)' to text |
| //www.cas.cn//kxyj/kj/js/ | 国家技术发明奖 | new tab | Add '(opens in new tab)' to text |
| //www.cas.cn//kxyj/kj/jb/ | 国家科学技术进步奖 | new tab | Add '(opens in new tab)' to text |
| //www.cas.cn//kxyj/kj/hz/ | 国家科学技术合作奖 | new tab | Add '(opens in new tab)' to text |
| //www.cas.cn//kxyj/kj/casjc/ | 中国科学院杰出科技成… | new tab | Add '(opens in new tab)' to text |
| //www.cas.cn//kxyj/kj/cashz/ | 中国科学院国际科技合… | new tab | Add '(opens in new tab)' to text |
| http://www.tsaf.ac.cn/ | 陈嘉庚科学奖 | new tab | Add '(opens in new tab)' to text |
| //www.cas.cn/../../kxyj/kjqk/ | 科技期刊 | new tab | Add '(opens in new tab)' to text |
| https://www.sciengine.com/publications/l… | 品牌期刊 | new tab | Add '(opens in new tab)' to text |
| https://www.sciengine.com/publications/p… | 期刊集群 | new tab | Add '(opens in new tab)' to text |
| https://www.sciengine.com/publications/l… | 新办期刊 | new tab | Add '(opens in new tab)' to text |
| https://www.sciengine.com/publications/l… | SciEngine期刊 | new tab | Add '(opens in new tab)' to text |
| https://www.cas.cn/redirect/prp/xlcd/ | (empty) | empty | Add link text or aria-label |
| //www.cas.cn/../../syky/202604/t20260420… | 寒武纪新发现！科学家… | new tab | Add '(opens in new tab)' to text |
| //www.cas.cn/../../syky/202604/t20260420… | 研究解析甲状腺乳头状… | new tab | Add '(opens in new tab)' to text |
| //www.cas.cn/../../syky/202604/t20260402… | 科研人员提出实现月球… | new tab | Add '(opens in new tab)' to text |
| //www.cas.cn/../../syky/202604/t20260417… | 研究揭示蔷薇科水杨酸… | new tab | Add '(opens in new tab)' to text |
| //www.cas.cn/../../syky/202604/t20260417… | 快堆全堆芯流固耦合研… | new tab | Add '(opens in new tab)' to text |
| //www.cas.cn/../../syky/202604/t20260407… | 南极冰川加速流动的机… | new tab | Add '(opens in new tab)' to text |
| http://www.casip.ac.cn/ | (empty) | empty | Add link text or aria-label |
| //www.cas.cn/../../cg/zh/202604/t2026042… | 过程工程所安全氢基能… | new tab | Add '(opens in new tab)' to text |
| //www.cas.cn/../../cg/zh/202604/t2026042… | 东莞材料所自研高频软… | new tab | Add '(opens in new tab)' to text |
| //www.cas.cn/../../cg/zh/202604/t2026040… | 合肥研究院等研发的经… | new tab | Add '(opens in new tab)' to text |
| //www.cas.cn/../../cg/zh/202603/t2026031… | 上海高研院技术成果转… | new tab | Add '(opens in new tab)' to text |
| //www.cas.cn/../../cg/zh/202602/t2026022… | 我国自主研发多发性硬… | new tab | Add '(opens in new tab)' to text |
| //www.cas.cn/../../cg/zh/202602/t2026020… | 工程热物理所等在压缩… | new tab | Add '(opens in new tab)' to text |
| //www.cas.cn/../../cg/zh/202602/t2026020… | 电工所承担的国家重点… | new tab | Add '(opens in new tab)' to text |
| //www.cas.cn/../../cg/zh/202601/t2026011… | 青海盐湖所在碱性溶液… | new tab | Add '(opens in new tab)' to text |
| //www.cas.cn/../../cg/zh/202601/t2026011… | 上海硅酸盐所3D打印硅… | new tab | Add '(opens in new tab)' to text |
| //www.cas.cn/../../cg/zh/202601/t2026010… | “制氢+硫磺”，新技… | new tab | Add '(opens in new tab)' to text |
| //www.cas.cn/../../cg/zh/202512/t2025122… | 亿方级甲烷-二氧化碳… | new tab | Add '(opens in new tab)' to text |
| //www.cas.cn/../../cg/zh/202512/t2025122… | 国内首台套钢铁行业高… | new tab | Add '(opens in new tab)' to text |
| //www.ustc.edu.cn/ | (empty) | empty | Add link text or aria-label |
| //www.ustc.edu.cn/ | 中国科学技术大学（简… | new tab | Add '(opens in new tab)' to text |
| //www.ucas.ac.cn/ | (empty) | empty | Add link text or aria-label |
| //www.ucas.ac.cn/ | 中国科学院大学（简称… | new tab | Add '(opens in new tab)' to text |
| //www.shanghaitech.edu.cn/ | (empty) | empty | Add link text or aria-label |
| //www.shanghaitech.edu.cn/ | 上海科技大学（简称“… | new tab | Add '(opens in new tab)' to text |
| //www.cas.cn/../../rcjy/gz/202604/t20260… | 青藏高原所与云南师范… | new tab | Add '(opens in new tab)' to text |
| //www.cas.cn/../../rcjy/gz/202603/t20260… | 物理所研究员靳常青获… | new tab | Add '(opens in new tab)' to text |
| //www.cas.cn/../../rcjy/gz/202602/t20260… | 青藏高原所与西南民族… | new tab | Add '(opens in new tab)' to text |
| //www.cas.cn/../../rcjy/gz/202601/t20260… | 国科大举办2025拾光奉… | new tab | Add '(opens in new tab)' to text |
| //www.cas.cn/../../rcjy/gz/202512/t20251… | 上海分院与上海交通大… | new tab | Add '(opens in new tab)' to text |
| //www.cas.cn/../../rcjy/gz/202512/t20251… | 2025年中国科大科教融… | new tab | Add '(opens in new tab)' to text |
| http://www.casmooc.cn/ | (empty) | empty | Add link text or aria-label |
| http://job.cas.cn/ | (empty) | empty | Add link text or aria-label |
| http://www.casjob.com/ | (empty) | empty | Add link text or aria-label |
| https://720yun.com/t/jlag4om4g7hndq89cy?… | 中国科学院国家授时中… | new tab | Add '(opens in new tab)' to text |
| http://museum.kiz.cas.cn/ | 中国科学院昆明动物研… | new tab | Add '(opens in new tab)' to text |
| http://kjg.hfcas.ac.cn/ | 中国科学院合肥物质科… | new tab | Add '(opens in new tab)' to text |
| http://www.nmp.ac.cn/ | 中国科学院南京地质古… | new tab | Add '(opens in new tab)' to text |
| http://www.kepu.net.cn/vmuseum/kpcg/bwg/… | 中国科学院动物研究所… | new tab | Add '(opens in new tab)' to text |
| http://www.kepu.net.cn/vmuseum/kpcg/bbg/… | 中国科学院新疆生态与… | new tab | Add '(opens in new tab)' to text |
| http://www.egi.cas.cn/yjpt/xjzrbwg/ | 中国科学院新疆生态与… | new tab | Add '(opens in new tab)' to text |
| http://scicn.casad.cas.cn/ | 科学与中国 | new tab | Add '(opens in new tab)' to text |
| //www.cas.cn/../../kx/gz/202604/t2026040… | 2026“科学与中国——… | new tab | Add '(opens in new tab)' to text |
| //www.cas.cn/../../kx/gz/202604/t2026040… | “科学与中国——千名… | new tab | Add '(opens in new tab)' to text |
| //www.cas.cn/../../kx/gz/202603/t2026033… | 亚热带生态所开展“科… | new tab | Add '(opens in new tab)' to text |
| //www.cas.cn/../../kx/gz/202603/t2026032… | 上海硅酸盐所开展科普… | new tab | Add '(opens in new tab)' to text |
| //www.cas.cn/../../kx/gz/202603/t2026032… | “科学与中国——千名… | new tab | Add '(opens in new tab)' to text |
| //www.cas.cn/../../kx/gz/202603/t2026031… | 版纳植物园举办“树说… | new tab | Add '(opens in new tab)' to text |
| //www.cas.cn/../../kx/gz/202602/t2026022… | 兰州化物所开展科普研… | new tab | Add '(opens in new tab)' to text |
| http://www.kepu.net.cn/ | 中国科普博览 | new tab | Add '(opens in new tab)' to text |
| //www.cas.cn/../../djcx/gz/202604/t20260… | 成都分院举办树立和践… | new tab | Add '(opens in new tab)' to text |
| //www.cas.cn/../../djcx/gz/202604/t20260… | 苏州纳米所举办树立和… | new tab | Add '(opens in new tab)' to text |
| //www.cas.cn/../../djcx/gz/202604/t20260… | 亚热带生态所举办树立… | new tab | Add '(opens in new tab)' to text |
| //www.cas.cn/../../djcx/gz/202604/t20260… | 空间应用中心党委举办… | new tab | Add '(opens in new tab)' to text |
| //www.cas.cn/../../djcx/gz/202604/t20260… | 武汉分院分党组举办树… | new tab | Add '(opens in new tab)' to text |
| //www.cas.cn/../../djcx/gz/202604/t20260… | 软件所举办树立和践行… | new tab | Add '(opens in new tab)' to text |
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| ./zcjd/202511/t20251113_5088524.shtml | 教育部等七部门关于加… | new tab | Add '(opens in new tab)' to text |
| https://www.cas.cn/zt/sszt/zjg/ | (empty) | empty | Add link text or aria-label |
| https://www.cas.cn/zt/hyzt/cas2026gzh/ | (empty) | empty | Add link text or aria-label |
| https://www.cas.cn/zt/sszt/20szqh/ | (empty) | empty | Add link text or aria-label |
| ./jl/wf/ | 违纪违法举报 | new tab | Add '(opens in new tab)' to text |
| http://idea.cas.cn/ | 科学智慧火花 | new tab | Add '(opens in new tab)' to text |
| ./jl/zjdc/ | 征集调查 | new tab | Add '(opens in new tab)' to text |
| ./jl/xfqd/ | 信访渠道 | new tab | Add '(opens in new tab)' to text |
| https://www.cas.cn/zt/sszt/zjg/ | (empty) | empty | Add link text or aria-label |
| https://www.cas.cn/zt/hyzt/cas2026gzh/ | (empty) | empty | Add link text or aria-label |
| https://www.cas.cn/zt/sszt/20szqh/ | (empty) | empty | Add link text or aria-label |
| ./jl/wf/ | 违纪违法举报 | new tab | Add '(opens in new tab)' to text |
| http://idea.cas.cn/ | 科学智慧火花 | new tab | Add '(opens in new tab)' to text |
| ./jl/zjdc/ | 征集调查 | new tab | Add '(opens in new tab)' to text |
| ./jl/xfqd/ | 信访渠道 | new tab | Add '(opens in new tab)' to text |
| //zgkxy.xuexi.cn/ | 学习强国 | new tab | Add '(opens in new tab)' to text |
| http://job.cas.cn | 中国科学院招聘网 | new tab | Add '(opens in new tab)' to text |
| https://www.cas.cn/redirect/prp/index/ | 院级科技专项信息管理… | new tab | Add '(opens in new tab)' to text |
| //weibo.com/zkyzs | (empty) | empty | Add link text or aria-label |
| //beian.miit.gov.cn/ | 京ICP备05002857号-1 | new tab | Add '(opens in new tab)' to text |
| https://zfwzgl.www.gov.cn/exposure/jiucu… | (empty) | empty | Add link text or aria-label |
| http://bszs.conac.cn/sitename?method=sho… | (empty) | empty | Add link text or aria-label |
| https://www.cas.cn/lib/js/plugin/wza/hel… | .cls-1{fill:#fff;} | new tab | Add '(opens in new tab)' to text |
| javascript:void(0); | .cls-1{fill:#fff;} | new tab | Add '(opens in new tab)' to text |
| <input> | (empty) | empty | Add button text or aria-label |
| <input> | (empty) | empty | Add button text or aria-label |
125 links and buttons have descriptive text
Links without text are announced as raw URLs by screen readers.
//www.cas.cn/; #; http://english.cas.cn; javascript:void(0);; #; #; https://www.cas.cn/redirect/prp/xlcd/; http://www.casip.ac.cn/; //www.ustc.edu.cn/; //www.ucas.ac.cn/ (+38 more)
Why this matters
Links with no accessible text (empty <a></a>, image-only no alt, icon-only no aria-label) are unidentifiable to screen readers.
Source: WCAG 2.1 SC 2.4.4
Image-only links need alt text on the image (or aria-label on the link) so screen readers can announce them.
a[href="//www.cas.cn/houjianguo/"]; a[href="//www.cas.cn/wuzhaohui/"]; a[href="//www.cas.cn/sunyegang/"]; a[href="//www.cas.cn/zhouqi/"]; a[href="//www.cas.cn/wangkeqiang/"]; a[href="//www.cas.cn/dingchibiao/"]; a[href="//www.cas.cn/hehongping/"]; a[href="//www.cas.cn/sunxiaoming/"]; a[href="//www.cas.cn/wanghua/"]; a[href="//www.cas.cn/wenya/"] (+40 more)
Why this matters
Image-only links with no alt are unidentifiable to screen-reader users — link's destination is invisible.
Source: WCAG 2.1 SC 2.4.4
Add '(opens in new tab)' to link text or aria-label.
http://english.cas.cn; //mail.cstnet.cn/; //www.cas.cn/../../kxyj/kjzx/; http://www.casip.ac.cn/; //www.cas.cn/../../rcjy/zkyjyjj/; //www.cas.cn/../../rcjy/zkd/; //www.cas.cn/../../rcjy/gkd/; //www.cas.cn/../../rcjy/skd/; http://www.casad.cas.cn/; http://scicn.casad.cas.cn/ (+214 more)
Why this matters
Links with target="_blank" without rel="noopener" leak the originating page's window context — security and UX issue.
Learn more ▾ ▴
Without rel="noopener", the new tab can navigate the original tab via window.opener (tab-nabbing attack). Modern browsers default to noopener for target=_blank but only since recent versions. Always set rel="noopener noreferrer" explicitly.
Source: MDN target / OWASP
Icon-only buttons need an aria-label so screen readers can announce them.
input[type="button"]#sub-pc; input[type="submit"]#sub-mobile
Why this matters
Buttons with no accessible text (icon-only, no aria-label) can't be activated by voice control or understood by screen readers.
Source: WCAG 2.1 SC 4.1.2
F404 Error PageActionHTTP 404, bare pageFIX
404 Error Page
ActionHTTP 404, bare page
HTTP 404, bare page
Info::
Correct 404 status code returned
Got: HTTP 404
Warning::
Bare server default 404 page
The 404 page has no custom styling. Users hitting a broken link see a generic error with no way to navigate back. Add a custom 404 page with your site navigation and a search bar.
404 Page Quality Default 404 Page
Status Code HTTP 404 ✓Page Title 页面没有找到 ✓Custom Styling ✗Navigation ✗Homepage Link ✗Search Form ✗
DWeb ManifestActionNot foundFIX
Web Manifest
ActionNot found
Not found
Info::
No web manifest found
No manifest at standard paths (/manifest.json, /site.webmanifest). A manifest is optional but enables PWA features like home screen installation and standalone display.
No web manifest found.
DDark Mode SupportActionNo dark mode signalsFIX
Dark Mode Support
ActionNo dark mode signals
No dark mode signals
Info::
No dark mode signals detected
Consider adding CSS with @media (prefers-color-scheme: dark) and <meta name='color-scheme' content='light dark'>.
Info::
Detection limited to meta tags and inline styles
External CSS files may contain prefers-color-scheme rules not visible to this scan.
Dark ModeNo Dark Mode Detected
color-scheme meta Not set ✗Dark theme-color Not set ✗CSS indicators Not detected ✗
Detection limited to meta tags and inline styles.
DPrint StylesheetActionNo print stylesFIX
Print Stylesheet
ActionNo print styles
No print styles
Info::
No print-specific styles detected
When users print this page, they get the screen layout including navigation and non-essential elements. Add @media print rules to hide navigation and optimize layout for paper.
Print Stylesheet No Print Styles
Print stylesheet Not found ✗Inline @media print Not detected ✗
DLighthouse Accessibility AuditsActionScore 55/100 — 9 failing, 10 passedFIX
Lighthouse Accessibility Audits
ActionScore 55/100 — 9 failing, 10 passed
55
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 |
|---|
2026年04月14日 div.yw_img > h5 > div.date > span |
2026年02月11日 div.tab_con > ul.tzgg > li > p |
2026年04月20日 div.tab_con > ul.tzgg > li > p |
These are opportunities to improve the legibility of your content.
Internationalization and localization
If a page doesn't specify a `lang` attribute, a screen reader assumes that the page is in the default language that the user chose when setting up the screen reader. If the page isn't actually in the default language, then the screen reader might not announce the page's text correctly. Learn more about the `lang` attribute.
Why this matters
Performance issues directly impact user engagement and conversion rates.
| Failing Elements |
|---|
html html |
These are opportunities to improve the interpretation of your content by users in different locales.
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 |
|---|
div.top2 > div.container > a.xsdlogotop > img.logo div.top2 > div.container > a.xsdlogotop > img.logo |
div.container > div.top_link_m > a#change_pc > img div.container > div.top_link_m > a#change_pc > img |
div.container > div.top_link_m > a > img div.container > div.top_link_m > a > img |
div.container > div.top_link_m > a#toolbarSwitchmob > img div.container > div.top_link_m > a#toolbarSwitchmob > img |
div.container > div.top_link_m > a > img#m_search div.container > div.top_link_m > a > img#m_search |
ul.swiper-wrapper > li.swiper-slide > a > img.focus_img_m ul.swiper-wrapper > li.swiper-slide > a > img.focus_img_m |
ul.swiper-wrapper > li.swiper-slide > a > img.focus_img_m ul.swiper-wrapper > li.swiper-slide > a > img.focus_img_m |
ul.swiper-wrapper > li.swiper-slide > a > img.focus_img_m ul.swiper-wrapper > li.swiper-slide > a > img.focus_img_m |
ul.swiper-wrapper > li.swiper-slide > a > img.focus_img_m ul.swiper-wrapper > li.swiper-slide > a > img.focus_img_m |
ul.swiper-wrapper > li.swiper-slide > a > img.focus_img_m ul.swiper-wrapper > li.swiper-slide > a > img.focus_img_m |
ul.swiper-wrapper > li.swiper-slide > a > img.focus_img_m ul.swiper-wrapper > li.swiper-slide > a > img.focus_img_m |
ul.swiper-wrapper > li.swiper-slide > a > img.focus_img_m ul.swiper-wrapper > li.swiper-slide > a > img.focus_img_m |
ul.swiper-wrapper > li.swiper-slide > a > img.focus_img_m ul.swiper-wrapper > li.swiper-slide > a > img.focus_img_m |
div.clearfix > div.videopad > a > img div.clearfix > div.videopad > a > img |
ul.tab_title > li.tab_title_yw1 > a > img ul.tab_title > li.tab_title_yw1 > a > img |
ul.tab_title > li.now > a > img ul.tab_title > li.now > a > img |
div.tab_con > div.yw_img > a > img.hvr-grow div.tab_con > div.yw_img > a > img.hvr-grow |
ul.tab_title > li.now > a > img ul.tab_title > li.now > a > img |
ul.tab_title > li > a > img ul.tab_title > li > a > img |
div.tab_con > div.ky_img > a > img.hvr-grow div.tab_con > div.ky_img > a > img.hvr-grow |
ul.tab_title > li.now > a > img ul.tab_title > li.now > a > img |
ul.tab_title > li > a > img ul.tab_title > li > a > img |
div.tab_con > div.ky_img > a > img.hvr-grow div.tab_con > div.ky_img > a > img.hvr-grow |
ul.videoBox > li.hvr-grow-img > a > img.zj_mobblock ul.videoBox > li.hvr-grow-img > a > img.zj_mobblock |
ul.videoBox > li.hvr-grow-img > a > img.zj_mobblock ul.videoBox > li.hvr-grow-img > a > img.zj_mobblock |
ul.videoBox > li.videopad > a > img ul.videoBox > li.videopad > a > img |
ul.tab_title > li.now > a > img ul.tab_title > li.now > a > img |
ul.tab_title > li > a > img ul.tab_title > li > a > img |
ul.tab_title > li.now > a > img ul.tab_title > li.now > a > img |
ul.tab_title > li > a > img ul.tab_title > li > a > img |
div.tab_con > div.video_left > a > img div.tab_con > div.video_left > a > img |
div.tab_con > div.video_left > a > img.video_play2 div.tab_con > div.video_left > a > img.video_play2 |
div.video_right > div.video_img > a > img div.video_right > div.video_img > a > img |
div.video_right > div.video_img > a > img.video_play2 div.video_right > div.video_img > a > img.video_play2 |
div.video_right > div.video_img > a > img div.video_right > div.video_img > a > img |
div.video_right > div.video_img > a > img.video_play2 div.video_right > div.video_img > a > img.video_play2 |
ul.tab_title > li.now > a > img ul.tab_title > li.now > a > img |
ul.tab_title > li > a > img ul.tab_title > li > a > img |
ul.tab_title > li.now > a > img ul.tab_title > li.now > a > img |
ul.tab_title > li > a > img ul.tab_title > li > a > img |
div.divBox > div.div_title > p > img div.divBox > div.div_title > p > img |
div.swiper-wrapper > div.swiper-slide > a > img div.swiper-wrapper > div.swiper-slide > a > img |
div.swiper-wrapper > div.swiper-slide > a > img div.swiper-wrapper > div.swiper-slide > a > img |
div.swiper-wrapper > div.swiper-slide > a > img div.swiper-wrapper > div.swiper-slide > a > img |
div.divBox > div.jl > div.jl_left > img div.divBox > div.jl > div.jl_left > img |
ul.jl_list > li.jl_col2 > a > img ul.jl_list > li.jl_col2 > a > img |
ul.jl_list > li.jl_col4 > a > img ul.jl_list > li.jl_col4 > a > img |
ul.jl_list > li.jl_col5 > a > img ul.jl_list > li.jl_col5 > a > img |
ul.jl_list > li.jl_col7 > a > img ul.jl_list > li.jl_col7 > a > img |
div.tj > div.div_title > p > img div.tj > div.div_title > p > img |
ul.tj_list > li.hvr-grow-img > a > img ul.tj_list > li.hvr-grow-img > a > img |
ul.tj_list > li.hvr-grow-img > a > img ul.tj_list > li.hvr-grow-img > a > img |
ul.tj_list > li.hvr-grow-img > a > img ul.tj_list > li.hvr-grow-img > a > img |
div.boxcenter > div.foot_txt > p > img div.boxcenter > div.foot_txt > p > img |
li > span#_span_jiucuo > a > img li > span#_span_jiucuo > a > img |
li > span#_ideConac > a > img#imgConac li > span#_ideConac > a > img#imgConac |
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 |
|---|
body > div.top2 > div.container > a.xsdlogotop body > div.top2 > div.container > a.xsdlogotop |
div.top2 > div.container > div.top_link_m > a#change_pc div.top2 > div.container > div.top_link_m > a#change_pc |
div.top2 > div.container > div.top_link_m > a div.top2 > div.container > div.top_link_m > a |
div.top2 > div.container > div.top_link_m > a#toolbarSwitchmob div.top2 > div.container > div.top_link_m > a#toolbarSwitchmob |
div.top2 > div.container > div.top_link_m > a div.top2 > div.container > div.top_link_m > a |
div.top2 > div.container > div.top_link_m > a div.top2 > div.container > div.top_link_m > a |
body > div.container > div.topTitle > a body > div.container > div.topTitle > a |
div#swiper_container_top_Focus > ul.swiper-wrapper > li.swiper-slide > a div#swiper_container_top_Focus > ul.swiper-wrapper > li.swiper-slide > a |
div#swiper_container_top_Focus > ul.swiper-wrapper > li.swiper-slide > a div#swiper_container_top_Focus > ul.swiper-wrapper > li.swiper-slide > a |
div#swiper_container_top_Focus > ul.swiper-wrapper > li.swiper-slide > a div#swiper_container_top_Focus > ul.swiper-wrapper > li.swiper-slide > a |
div#swiper_container_top_Focus > ul.swiper-wrapper > li.swiper-slide > a div#swiper_container_top_Focus > ul.swiper-wrapper > li.swiper-slide > a |
div#swiper_container_top_Focus > ul.swiper-wrapper > li.swiper-slide > a div#swiper_container_top_Focus > ul.swiper-wrapper > li.swiper-slide > a |
div#swiper_container_top_Focus > ul.swiper-wrapper > li.swiper-slide > a div#swiper_container_top_Focus > ul.swiper-wrapper > li.swiper-slide > a |
div#swiper_container_top_Focus > ul.swiper-wrapper > li.swiper-slide > a div#swiper_container_top_Focus > ul.swiper-wrapper > li.swiper-slide > a |
div#swiper_container_top_Focus > ul.swiper-wrapper > li.swiper-slide > a div#swiper_container_top_Focus > ul.swiper-wrapper > li.swiper-slide > a |
div#swiper_container_top_Focus > ul.swiper-wrapper > li.swiper-slide > a div#swiper_container_top_Focus > ul.swiper-wrapper > li.swiper-slide > a |
div#swiper_container_top_Focus > ul.swiper-wrapper > li.swiper-slide > a div#swiper_container_top_Focus > ul.swiper-wrapper > li.swiper-slide > a |
div#swiper_container_top_Focus > ul.swiper-wrapper > li.swiper-slide > a div#swiper_container_top_Focus > ul.swiper-wrapper > li.swiper-slide > a |
div#swiper_container_top_Focus > ul.swiper-wrapper > li.swiper-slide > a div#swiper_container_top_Focus > ul.swiper-wrapper > li.swiper-slide > a |
div#swiper_container_top_Focus > ul.swiper-wrapper > li.swiper-slide > a div#swiper_container_top_Focus > ul.swiper-wrapper > li.swiper-slide > a |
div#swiper_container_top_Focus > ul.swiper-wrapper > li.swiper-slide > a div#swiper_container_top_Focus > ul.swiper-wrapper > li.swiper-slide > a |
div#swiper_container_top_Focus > ul.swiper-wrapper > li.swiper-slide > a div#swiper_container_top_Focus > ul.swiper-wrapper > li.swiper-slide > a |
div#swiper_container_top_Focus > ul.swiper-wrapper > li.swiper-slide > a div#swiper_container_top_Focus > ul.swiper-wrapper > li.swiper-slide > a |
div.container > div.clearfix > div.videopad > a div.container > div.clearfix > div.videopad > a |
div#m_swiper_zt > div.swiper-wrapper > div.swiper-slide > a div#m_swiper_zt > div.swiper-wrapper > div.swiper-slide > a |
div#m_swiper_zt > div.swiper-wrapper > div.swiper-slide > a div#m_swiper_zt > div.swiper-wrapper > div.swiper-slide > a |
div#m_swiper_zt > div.swiper-wrapper > div.swiper-slide > a div#m_swiper_zt > div.swiper-wrapper > div.swiper-slide > a |
div.foot_img > li > span#_span_jiucuo > a div.foot_img > li > span#_span_jiucuo > a |
div.foot_img > li > span#_ideConac > a div.foot_img > li > span#_ideConac > a |
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.
Tables and lists
Screen readers have a specific way of announcing lists. Ensuring proper list structure aids screen reader output. Learn more about proper list structure.
Why this matters
Performance issues directly impact user engagement and conversion rates.
| Failing Elements |
|---|
李昕欣：传感器研究从应用中来，到应用中去
徐新文：沙漠里编织“绿丝带”
包云岗：“科研重工业模式”践行者
科技为犁，耕护黑土粮仓
更多学者风采 + div.divBox3 > div.tabBox > div.tab_con > ul.xk_list |
蔡长塔|
传承践行正确政绩观 勇担抢占科技制高点时代使命
王赤|
树立和践行正确政绩观，以实干实绩加快抢占空间科技制高点
向华|
以高水平科技自立自… div.divBox3 > div.tabBox > div.tab_con > ul.tzgg |
Screen readers require list items (`<li>`) to be contained within a parent `<ul>`, `<ol>` or `<menu>` to be announced properly. Learn more about proper list structure.
Why this matters
Performance issues directly impact user engagement and conversion rates.
| Failing Elements |
|---|
div.foot > div.boxcenter > div.foot_img > li div.foot > div.boxcenter > div.foot_img > li |
div.foot > div.boxcenter > div.foot_img > li div.foot > div.boxcenter > div.foot_img > li |
These are opportunities to improve the experience of reading tabular or list data using assistive technology, like a screen reader.
Best practices
Disabling zooming is problematic for users with low vision who rely on screen magnification to properly see the contents of a web page. Learn more about the viewport meta tag.
Why this matters
Informational: a Permissions-Policy directive showing feature -> allowed origins.
Source: MDN Permissions-Policy
| Failing Elements |
|---|
head > meta head > meta |
body > meta body > meta |
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.
Navigation
A value greater than 0 implies an explicit navigation ordering. Although technically valid, this often creates frustrating experiences for users who rely on assistive technologies. Learn more about the `tabindex` attribute.
Why this matters
Performance issues directly impact user engagement and conversion rates.
| Failing Elements |
|---|
按回车键在新窗口打开无障碍说明页面,按Ctrl+~键打开导盲模式。 body > a#esdTipLink1 |
These are opportunities to improve keyboard navigation in your application.
○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>`
●`[aria-*]` attributes have valid values
●`[aria-*]` attributes are valid and not misspelled
●ARIA attributes are used as specified for the element's role
●Elements use only permitted ARIA attributes
●Document has a `<title>` element
●Links are distinguishable without relying on color.
●Touch targets have sufficient size and spacing.
●Heading elements appear in a sequentially-descending order
○`[accesskey]` values are unique
○`button`, `link`, and `menuitem` elements have accessible names
○Deprecated ARIA roles were not used
○Elements with `role="dialog"` or `role="alertdialog"` have accessible names.
○`[aria-hidden="true"]` elements do not contain focusable descendents
○ARIA input fields have accessible names
○ARIA `meter` elements have accessible names
○ARIA `progressbar` elements have accessible names
○`[role]`s have all required `[aria-*]` attributes
○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
○`[role]` values are valid
○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
○Buttons have an accessible name
○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 a valid value for its `[lang]` attribute
○`<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
○Form elements have associated labels
○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.
○Identical links have the same purpose.
○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.
BHeading Hierarchy8 headingsREVIEW
Heading Hierarchy
8 headings
8 headings
Critical::
No H1 heading found
Every page should have one H1 that describes the page content.
- H5 院机关
- H5 派驻机构
- H5 分院
- H5 院属机构
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Every page should have one H1 that describes the page content.
Why this matters
No H1 means screen-reader users can't identify the page's primary topic, and Google's content-extraction degrades.
Learn more ▾ ▴
The H1 is the document title for assistive tech and a strong signal to search engines about page topic. Pages without one force screen readers to fall back to the <title> attribute or page chrome. Add a single H1 that names the page's primary subject.
Source: WCAG 2.4.6 / Google Search Central
CFavicon & BrandingAction3 icon(s) detectedREVIEW
Favicon & Branding
Action3 icon(s) detected
3 icon(s) detected
Info::
favicon.ico present at site root
Info::
HTML icon links detected
Info::
Apple touch icon present
✓ favicon.ico Present
✓ PNG Icons Present
✓ Apple Touch Present
✗ SVG Favicon Missing
✗ Manifest Icons Missing
✗ Multiple Sizes Missing
CColor Contrast (Screenshot)Action20 text elements analyzed, 6 fail WCAG AAREVIEW
Color Contrast (Screenshot)
Action20 text elements analyzed, 6 fail WCAG AA
Analyzes text contrast against the actual rendered page, including background images, gradients, and overlays that CSS-based tools cannot detect.
14 pass 6 fail WCAG AA
a 联系我们
4.01:1#000000
on#C13E37
needs 4.5:1 (normal text)16px · top of page (header area)
a 院况简介
3.46:1#000000
on#C11D1E
needs 4.5:1 (normal text)16px · above the fold
a 院领导集体
3.82:1#000000
on#7D5D8C
needs 4.5:1 (normal text)16px · above the fold · over background image/gradient
a 科学研究
3.29:1#000000
on#4354C3
needs 4.5:1 (normal text)16px · mid-page
a 科技专项
3.52:1#000000
on#4859C6
needs 4.5:1 (normal text)16px · mid-page
a 科技奖励
3.24:1#000000
on#4752C0
needs 4.5:1 (normal text)16px · mid-page
1 contrast failures on background images/gradients
These failures are invisible to CSS-based accessibility tools like Lighthouse. The text may be fine on a solid background, but fails when rendered over an image or gradient.
Show all checked elements (20)
| Element | Ratio | Required | FG | BG | Result |
|---|---|---|---|---|---|
| title 中国科学院 | 21.00:1 | 4.5:1 | #000000 | #FFFFFF | Pass |
| a English | 21.00:1 | 4.5:1 | #000000 | #FFFFFF | Pass |
| a 联系我们 | 4.01:1 | 4.5:1 | #000000 | #C13E37 | Fail |
| a 网站地图 | 8.02:1 | 4.5:1 | #000000 | #DA8B87 | Pass |
| a 邮箱 | 21.00:1 | 4.5:1 | #000000 | #FFFFFF | Pass |
| a 无障碍 | 14.25:1 | 4.5:1 | #000000 | #B4DAF2 | Pass |
| a 关怀版 | 12.55:1 | 4.5:1 | #000000 | #BDC9DC | Pass |
| a 首页 | 17.76:1 | 4.5:1 | #000000 | #F7E9E7 | Pass |
| a 组织机构 | 18.72:1 | 4.5:1 | #000000 | #FFEEEE | Pass |
| a 主要职责 | 10.63:1 | 4.5:1 | #000000 | #F5A3A0 | Pass |
| a 院况简介 | 3.46:1 | 4.5:1 | #000000 | #C11D1E | Fail |
| a 院领导集体 | 3.82:1 | 4.5:1 | #000000 | #7D5D8C | Fail |
| a 机构设置 | 12.96:1 | 4.5:1 | #000000 | #CBCAD6 | Pass |
| a 科学研究 | 3.29:1 | 4.5:1 | #000000 | #4354C3 | Fail |
| a 科技专项 | 3.52:1 | 4.5:1 | #000000 | #4859C6 | Fail |
| a 科技奖励 | 3.24:1 | 4.5:1 | #000000 | #4752C0 | Fail |
| a 科技期刊 | 10.42:1 | 4.5:1 | #000000 | #A7B4EF | Pass |
| a 科研进展 | 21.00:1 | 4.5:1 | #000000 | #FFFFFF | Pass |
| a 成果转化 | 21.00:1 | 4.5:1 | #000000 | #FFFFFF | Pass |
| a 知识产权与科… | 21.00:1 | 4.5:1 | #000000 | #FFFFFF | Pass |
Methodology: The top 20 text elements by font size were checked. Background color was sampled from the desktop screenshot using a 5-point pattern. WCAG 2.1 AA requires 4.5:1 for normal text and 3:1 for large text.
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.