www.cdc.gov: week 2026-W37
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Change this week
- New this week
- 0
- Fixed this week
- 0
- Regressed this week
- 7
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Findings scoped to your excluded URLs, matching this view (counts use the same up-to-25-page sample).
Fix these first
| Issue | Severity | Pages | Who it affects | How to fix | Evidence |
|---|---|---|---|---|---|
| All page content should be contained by landmarks (WCAG criterion undetermined) (rule↗) | Serious | 2924 | — | Wrap all page content in landmarks (header, nav, main, footer) so users can navigate by region. | pages (CSV) |
| Images must have alternative text (WCAG 1.1.1) (rule↗) | Critical | 596 | Without vision, Limited vision | Give every <img> a meaningful alt attribute. Use alt="" only for decorative images so screen readers skip them. | pages (CSV) |
| Landmarks should have a unique role or role/label/title (i.e. accessible name) c (WCAG criterion undetermined) (rule↗) | Moderate | 937 | — | When a landmark role/type repeats (e.g. two <nav>s), give each a distinct accessible name with aria-label or aria-labelledby (e.g. "Primary" and "Footer" navigation) so screen-reader users can tell them apart. | pages (CSV) |
| <html> element must have a lang attribute (WCAG 3.1.1) (rule↗) | Serious | 589 | Without vision, Limited cognitive, language, or learning ability | Add a lang attribute to <html> (e.g. lang="en"). | pages (CSV) |
| Heading levels should only increase by one (WCAG criterion undetermined) (rule↗) | Moderate | 887 | — | Use heading levels in order (h1 → h2 → h3) without skipping; structure, not size. | pages (CSV) |
| Elements must meet minimum color contrast ratio thresholds (WCAG 1.4.3) (rule↗) | Serious | 544 | Limited vision, Without color perception | Increase the contrast between text and its background to at least 4.5:1 (3:1 for large text). Check both light and dark modes. | pages (CSV) |
| Document should have one main landmark (WCAG criterion undetermined) (rule↗) | Moderate | 743 | — | Each page should have exactly one <main> landmark. | pages (CSV) |
| Target size is at least 44×44 CSS pixels (Enhanced) (WCAG 2.5.5) (rule↗) | Moderate | 720 | — | See remediation guidance: https://alfa.siteimprove.com/rules/sia-r111 | pages (CSV) |
Progress
| Week | Critical | Serious | Moderate | Minor |
|---|---|---|---|---|
| 2026-W24 | 2 | 14 | 40 | 4 |
| 2026-W25 | 6 | 16 | 47 | 5 |
| 2026-W26 | 6 | 16 | 47 | 5 |
| 2026-W27 | 4 | 15 | 50 | 4 |
| 2026-W28 | 6 | 17 | 48 | 4 |
| 2026-W29 | 8 | 20 | 53 | 5 |
| 2026-W30 | 7 | 18 | 53 | 4 |
| 2026-W31 | 7 | 19 | 51 | 5 |
| 2026-W32 | 5 | 19 | 47 | 6 |
| 2026-W33 | 6 | 19 | 50 | 5 |
| 2026-W34 | 6 | 19 | 48 | 3 |
| 2026-W35 | 5 | 19 | 41 | 4 |
| 2026-W36 | 7 | 19 | 48 | 5 |
| 2026-W37 | 4 | 16 | 49 | 5 |
Dropped from this week's sample
- Moderate VS-388b5438 Scrollable element is keyboard accessible (WCAG 1.4.8)
- Serious VS-7430f84c Elements should not have tabindex greater than zero (WCAG criterion undetermined)
- Critical VS-9429bb8d Certain ARIA roles must contain particular children (WCAG 1.3.1)
- Moderate VS-e43903a1 Form field error is identified and described (WCAG criterion undetermined)
- Moderate VS-a84da368 Obsolete <blink> element (WCAG criterion undetermined)
- Critical VS-e7298c00 Buttons must have discernible text (WCAG 4.1.2)
- Moderate VS-30db094d Banner landmark should not be contained in another landmark (WCAG criterion undetermined)
- Critical VS-4e469a59 Active <area> elements must have alternative text (WCAG 2.4.4)
- Serious VS-ebb1c464 Elements must only use permitted ARIA attributes (WCAG 4.1.2)
- Critical VS-f6d344d5 Certain ARIA roles must be contained by particular parents (WCAG 1.3.1)
- Serious VS-fa724f90 ARIA dialog and alertdialog nodes should have an accessible name (WCAG criterion undetermined)
- Serious VS-f5a62bfa <object> elements must have alternative text (WCAG 1.1.1)
This week at a glance 74 issue type(s)
- Median axe violations / page
- 5
- Pages with axe violations
- 2926 of 2927
- Median Alfa failures / page
- 90
- Pages with Alfa failures
- 721 of 721
- Unique pages audited
- 2927
- Lighthouse performance (median)
- 80/100 details
- Lighthouse SEO (median)
- 100/100
- Lighthouse best practices (median)
- 96/100
- Lighthouse agentic (median)
- 97/100
- Words per page (median)
- 737
- Reading ease (median)
- 44
- Reading grade (median)
- 12
- Misspellings
- 25+ distinct details
- Broken links
- 993 details
- Median page weight
- 5.2 MB +288 KB worse
- Median requests per page
- 45
- Estimated energy per page (mean)
- 1.7203 Wh
Note: page counts differ between weeks (3331 → 3330). Prefer the "pages affected" columns over raw instance counts when comparing.
Scan coverage this week (3330 pages · 3459 succeeded of 3871 attempted)
| Engine | Pages | Coverage |
|---|---|---|
| axe | 2927 | 88% |
| resources | 2927 | 88% |
| plain-language | 1451 | 44% |
| standards | 1428 | 43% |
| alfa | 721 | 22% |
| sustainability | 371 | 11% |
| security | 310 | 9% |
| tech | 288 | 9% |
| lighthouse | 284 | 9% |
| deprecated-html | 275 | 8% |
Changes since 2026-W36 27 change(s)
axe-core
- New: aria-allowed-attr appeared this week.
- New: valid-lang appeared this week.
- Resolved: aria-required-children no longer fails on any scanned page.
- Resolved: landmark-banner-is-top-level no longer fails on any scanned page.
- Resolved: button-name no longer fails on any scanned page.
- Resolved: aria-required-parent no longer fails on any scanned page.
- Resolved: aria-prohibited-attr no longer fails on any scanned page.
- Resolved: object-alt no longer fails on any scanned page.
- Resolved: area-alt no longer fails on any scanned page.
- Resolved: tabindex no longer fails on any scanned page.
- Resolved: aria-dialog-name no longer fails on any scanned page.
- landmark-one-main shrank: 811 → 743 pages affected (rate: 27% → 25% of pages scanned).
- landmark-unique spread: 856 → 937 pages affected (rate: 29% → 32% of pages scanned).
Alfa
- New: sia-r90 appeared this week.
- New: sia-r17 appeared this week.
- New: sia-r7 appeared this week.
- New: sia-r85 appeared this week.
- New: sia-r1 appeared this week.
- Resolved: sia-r75 no longer fails on any scanned page.
- Resolved: sia-r80 no longer fails on any scanned page.
- sia-r18 spread: 366 → 378 pages affected (rate: 50% → 52% of pages scanned).
- sia-r57 spread: 529 → 553 pages affected (rate: 72% → 77% of pages scanned).
- sia-r69 spread: 220 → 243 pages affected (rate: 30% → 34% of pages scanned).
- sia-r74 shrank: 293 → 252 pages affected (rate: 40% → 35% of pages scanned).
- sia-r73 shrank: 250 → 210 pages affected (rate: 34% → 29% of pages scanned).
- sia-r70 shrank: 177 → 152 pages affected (rate: 24% → 21% of pages scanned).
- sia-r61 shrank: 78 → 51 pages affected (rate: 11% → 7% of pages scanned).
Embedded & linked resources
New this week (4658)
- https://www.cdc.gov/pcd/issues/2010/jul/pdf/09_0246.pdf
- https://www.cdc.gov/pcd/issues/2013/pdf/13_0015.pdf
- https://archive.cdc.gov/www_cdc_gov/nchs/data/nhis/NHIS_Supplements_and_Sponsors.pdf
- https://www.cdc.gov/nchs/data/nhis/Sample-Adult-Questionnaire.pdf
- https://www.cdc.gov/nchs/data/nhis/Sample-Child-Questionnaire.pdf
- https://www.youtube-nocookie.com/embed/8HRZOVKBMsE?autohide=0&enablejsapi=1&modestbranding=1&rel=0&origin=https://www.cdc.gov?autohide=0&enablejsapi=1&modestbranding=1&rel=0&origin=https://www.cdc.gov&wmode=opaque?enablejsapi=1
- http://www.cdc.gov/niosh/media/pdfs/2026/03/2008-100.pdf
- http://www.cdc.gov/niosh/media/images/2026/03/2008-100-thumb.png
- http://www.cdc.gov/iis/downloads/func-stds-v4-2-resource-guide-508.pdf
- http://www.cdc.gov/infectious-diseases-labs/specimen-submission/pdf/CSTOR-Frequently-Asked-Questions.pdf
- https://www.cdc.gov/mmwr/pdf/ss/ss6307.pdf
- https://www.cdc.gov/mmwr/pdf/wk/mm6053.pdf
- http://wwwn.cdc.gov/als/Download/ALS%20Registry%20Act%20(Public%20Law%20110-373).pdf
- http://www.cdc.gov/niosh/docs/2011-155/pdfs/2011-155.pdf
- http://www.cdc.gov/niosh/media/images/2026/06/2011-155.jpg
- https://www.cdc.gov/pcd/issues/2005/jan/pdf/04_0105.pdf
- http://www.ntsb.gov/safety/mwl/Documents/MWL2016_Brochure_web.pdf
- https://9866052.fls.doubleclick.net/activityi;src=9866052;type=cdctips;cat=spaudien;rcb=7;ord=1;num=3028399609384;npa=0;auiddc=2087543916.1789032464;uaa=x86;uab=64;uafvl=Chromium%3B148.0.7778.96%7CHeadlessChrome%3B148.0.7778.96%7CNot%252FA)Brand%3B99.0.0.0;uamb=0;uam=;uap=Windows;uapv=;uaw=0;pscdl=noapi;frm=0;_tu=aJA;gtm=45fe6980v9178920917z8852963185za200zd9178920917xea;gcd=13l3l3l3l1l1;dma=0;dc_fmt=2;tag_exp=115938465~115938468~117776795~118897920~118897930~120213116~120385423~120469145~120469153;epver=2;dc_random=1789033446_G7MGeoWjzveZAflf_SWhdsG82SgLFWubvg;_dc_test=1;~oref=https%3A%2F%2Fwww.cdc.gov%2Ftobacco%2Fcampaign%2Ftips%2Fspanish%2Fpoblaciones%2Faudiencia-general.html?
- https://www.cdc.gov/mmwr/volumes/66/wr/pdfs/mm6603a2.pdf
- http://www.cancer.org/downloads/STT/CPED2003PWSecured.pdf
- https://www.cdc.gov/c-diff/media/mp4s/ABX-Risk-Factor-MP4-1200by675.mp4
- https://www.cdc.gov/c-diff/media/mp4s/ABX-Risk-Factor-MP4-1080by1350.mp4
- http://www.cdc.gov/niosh/media/files/2026/03/2011-100.zip
- http://www.cdc.gov/niosh/media/images/2026/06/2011-100.jpg
- http://www.cdc.gov/niosh/media/pdfs/2026/06/2011-100_Instructor-copy.pdf
- http://www.cdc.gov/niosh/media/files/2026/06/2011-100_presentation.pptx
- https://www.cdc.gov/mmwr/volumes/66/wr/pdfs/mm6607md.pdf
- https://www.cdc.gov/mmwr/volumes/72/wr/pdfs/mm7208a3-H.pdf
- https://wastewater-observatory.jrc.ec.europa.eu/static/pdf/Sampling%20Aircrafts_FINAL_Version%209%20Jan%202023.pdf
- https://www.cdc.gov/TemplatePackage/contrib/widgets/tp-lms/index.html?chost=www.cdc.gov&cpath=/tobacco/campaign/tips/quit-smoking/quit-smoking-medications/why-quitting-smoking-is-hard/index.html&csearch=&chash=&ctitle=Why%20Quitting%20Smoking%20Is%20Hard%20%7C%20Quit%20Smoking%20%7C%20Tips%20From%20Former%20Smokers%20%7C%20CDC&wn=cdcquizwidget&wf=/TemplatePackage/contrib/widgets/tp-lms/&wid=cdcquizwidget1&mMode=widget&mPage=&mChannel=&title=what-is-the-main-addictive-chemical-in-tobacco-that-makes-quitting-hard&host=www.cdc.gov&contentPath=/tobacco/campaign/tips/quit-smoking/quit-smoking-medications/quizzes/&courseId=what-is-the-main-addictive-chemical-in-tobacco-that-makes-quitting-hard&contentVersion=116095-20241112152557
- https://9866052.fls.doubleclick.net/activityi;src=9866052;type=cdctips;cat=whyqthrd;rcb=5;ord=1;num=7736783948462;npa=0;auiddc=321933384.1789042964;uaa=x86;uab=64;uafvl=Chromium%3B148.0.7778.96%7CHeadlessChrome%3B148.0.7778.96%7CNot%252FA)Brand%3B99.0.0.0;uamb=0;uam=;uap=Windows;uapv=;uaw=0;pscdl=noapi;frm=0;_tu=KJA;gtm=45fe6980v9178920917z8852963185za200zb852963185zd852963185xeaxf1;gcd=13l3l3l3l1l1;dma=0;dc_fmt=2;tag_exp=115938466~115938469~118897920~118897930~119381662~120213116~120385422~120469145~120469153~120912439;epver=2;dc_random=1789042963_EjosG8civxmCJfiWhcf4nFn51z1NkX-5Gg;_dc_test=1;~oref=https%3A%2F%2Fwww.cdc.gov%2Ftobacco%2Fcampaign%2Ftips%2Fquit-smoking%2Fquit-smoking-medications%2Fwhy-quitting-smoking-is-hard%2Findex.html?
- https://www.youtube-nocookie.com/embed/IhE4QAWL59g?autohide=0&enablejsapi=1&modestbranding=1&rel=0&origin=https://www.cdc.gov?autohide=0&enablejsapi=1&modestbranding=1&rel=0&origin=https://www.cdc.gov&wmode=opaque?enablejsapi=1
- https://www.cdc.gov/niosh/docs/wp-solutions/2008-127/pdfs/2008-127.pdf
- https://www.cdc.gov/niosh/docs/wp-solutions/2008-127/images/2008-127fig1.jpg
- http://www.cdc.gov/niosh/media/pdfs/2026/04/2020-104.pdf
- http://www.cdc.gov/healthy-youth/media/images/2024/05/DASH-Mental-Health_2_1200x675-large.jpg
- http://www.cdc.gov/healthy-youth/media/images/2024/05/DASH-Mental-Health_1_1200x675-large.jpg
- http://www.cdc.gov/healthy-youth/media/images/2024/05/DASH-Mental-Health_3_1200x675-large.jpg
- http://www.cdc.gov/healthy-youth/media/images/2024/05/DASH-YRBS-Headline-Graphics_2021-large-1.jpg
- http://www.cdc.gov/healthy-youth/media/images/2024/05/CDC-DASH-LGBTQ-Infographic-large.jpg
- http://www.cdc.gov/healthy-youth/media/images/2024/05/transgender_teens_safe_supportive_schools-large.png
- http://www.cdc.gov/healthy-youth/media/images/2024/05/CDC-DASH-LGBTQ-1-large.png
- http://www.cdc.gov/healthy-youth/media/images/2024/05/CDC-DASH-LGBTQ-2-large.png
- http://www.cdc.gov/healthy-youth/media/images/2024/05/CDC-DASH-LGBTQ-3-large.png
- http://www.cdc.gov/healthy-youth/media/images/2024/05/CDC-DASH-LGBTQ-SM_Graphic-large.jpg
- http://www.cdc.gov/healthy-youth/media/images/2024/05/CDC-DASH-Transgender-Youth-large.jpg
- http://www.cdc.gov/healthy-youth/media/images/2024/05/youth_connectedness_visual_abstract.jpg
- http://www.cdc.gov/healthy-youth/media/images/2024/05/health_and_academics_policy_success_story-large.jpg
- http://www.cdc.gov/healthy-youth/media/images/2024/05/CDC-DASH-Youth-Health-large.jpg
- http://www.cdc.gov/healthy-youth/media/images/2024/05/DASH_WhySchools_SchoolHealth.png
- https://www.cdc.gov/foodborne-outbreaks/media/images/2026/02/353981-A_FIG_AnnualReportGraphics_0924_1.png
- https://www.cdc.gov/foodborne-outbreaks/media/images/2026/02/353981-A_FIG_AnnualReportGraphics_0924_2.png
- https://www.cdc.gov/foodborne-outbreaks/media/images/2026/02/353981-A_FIG_AnnualReportGraphics_0924_3.png
- https://www.cdc.gov/foodborne-outbreaks/media/images/2026/02/353981-A_FIG_AnnualReportGraphics_0924_4.png
- https://www.cdc.gov/mmwr/volumes/71/wr/pdfs/mm7144a2-H.pdf
- https://www.technet-21.org/media/com_resources/trl/7945/multi_upload/GuidingPrinciplesforImmunizationProgrammeRecovery.pdf
- http://www.cdc.gov/pcd/issues/2007/oct/pdf/06_0051.pdf
- http://www.cdc.gov/mmwr/volumes/74/wr/pdfs/mm7440a3-H.pdf
- http://www.cdc.gov/mmwr/volumes/74/wr/social-media/mm7440a3_RabiesSteerFarm_IMAGE_11December2025_1200x675.png
- https://www.cdc.gov/mmwr/preview/mmwrhtml/rr5415.pdf
- http://www.cdc.gov/long-term-care-facilities/media/pdfs/PPE-Nursing-Homes-508.pdf
- http://www.cdc.gov/long-term-care-facilities/media/pdfs/EBP-KeepResidentsSafe-Poster-508.pdf
- http://www.cdc.gov/long-term-care-facilities/media/pdfs/es/EBP-KeepResidentsSafe-Poster-ES-508.pdf
- http://www.cdc.gov/long-term-care-facilities/media/pdfs/EBP-MDROs-Poster-P.pdf
- http://www.cdc.gov/long-term-care-facilities/media/pdfs/EBP-PocketGuide-P.pdf
- http://www.cdc.gov/long-term-care-facilities/media/pdfs/PPE-Nursing-Homes-Table-508.pdf
- http://www.cdc.gov/long-term-care-facilities/media/pdfs/enhanced-barrier-precautions-sign-P.pdf
- http://www.cdc.gov/long-term-care-facilities/media/pdfs/es/enhanced-barrier-precautions-sign-ES-P.pdf
- http://www.cdc.gov/long-term-care-facilities/media/pdfs/Pre-Implementation-Tool-for-Enhanced-Barrier-Precautions-508.pdf
- http://www.cdc.gov/long-term-care-facilities/media/pdfs/Observations-Tool-for-Enhanced-Barrier-Precautions-Implementation-508.pdf
- http://www.cdc.gov/long-term-care-facilities/media/excel/Spreadsheet-to-Capture-and-Summarize-EBP-Observations.xlsx
- http://www.cdc.gov/long-term-care-facilities/media/ppts/EBP-Presentation-July2022.pptx
- http://www.cdc.gov/long-term-care-facilities/media/pdfs/Letter-Nursing-Home-Residents-Families-Friends-508.pdf
- http://www.cdc.gov/long-term-care-facilities/media/pdfs/Letter-Nursing-Home-Staff-508.pdf
- http://www.cdc.gov/long-term-care-facilities/media/pdfs/Enhanced-Barrier-Precautions-Letter-for-Nursing-Home-Leadership-508.pdf
- http://www.youtube-nocookie.com/embed/WuX1Jn7SoHw?autohide=0&enablejsapi=1&modestbranding=1&rel=0&origin=https://www.cdc.gov?autohide=0&enablejsapi=1&modestbranding=1&rel=0&origin=https://www.cdc.gov&wmode=opaque?enablejsapi=1
- http://www.youtube-nocookie.com/embed/XnEyD3yNKfA?autohide=0&enablejsapi=1&modestbranding=1&rel=0&origin=https://www.cdc.gov?autohide=0&enablejsapi=1&modestbranding=1&rel=0&origin=https://www.cdc.gov&wmode=opaque?enablejsapi=1
- http://www.youtube-nocookie.com/embed/NoL8PVp5KKc?autohide=0&enablejsapi=1&modestbranding=1&rel=0&origin=https://www.cdc.gov?autohide=0&enablejsapi=1&modestbranding=1&rel=0&origin=https://www.cdc.gov&wmode=opaque?enablejsapi=1
- http://www.youtube-nocookie.com/embed/ttAhCZGDzSA?autohide=0&enablejsapi=1&modestbranding=1&rel=0&origin=https://www.cdc.gov?autohide=0&enablejsapi=1&modestbranding=1&rel=0&origin=https://www.cdc.gov&wmode=opaque?enablejsapi=1
- https://www.google.com/recaptcha/api2/anchor?ar=1&k=6LeM0KEtAAAAAKn0tKzkwjUpuoLgDIZ6scJeF_mN&co=aHR0cHM6Ly93d3cuY2RjLmdvdjo0NDM.&hl=en&v=BnqMGSY_YP4cCmbNINHpJPkd&size=invisible&badge=inline&anchor-ms=20000&execute-ms=30000&cb=7u4cn2b6o78u
- https://www.google.com/recaptcha/api2/bframe?hl=en&v=BnqMGSY_YP4cCmbNINHpJPkd&k=6LeM0KEtAAAAAKn0tKzkwjUpuoLgDIZ6scJeF_mN&bft=0dAFcWeA72bA-ljxJa0sylt79LsUQAwuyAGXtZ-dehigER_q9ykkl2w3qW4zxVMkXQqmHjfZTmcvEKSF59d_EGPLAhWX5haP2CdQ
- https://www.cdc.gov/pcd/issues/2018/pdf/18_0150.pdf
- https://www.cdc.gov/niosh/docs/2017-126/pdfs/2017-126.pdf
- https://www.cdc.gov/niosh/docs/2017-126/images/2017-126.png
- http://www.cdc.gov/lyme/media/images/2026/07/NoTimeLyme_1200x675-X-Web-Branded_Nature-Walk.png
- http://www.cdc.gov/lyme/media/images/2026/07/NoTimeLyme_1080x1080-FB-Branded_Nature-Walk.png
- http://www.cdc.gov/lyme/media/images/2026/07/NoTimeLyme_1080x1350-IG-Branded_Nature-Walk.png
- http://www.cdc.gov/lyme/media/images/2026/07/NoTimeLyme_1200x675-X-Web-Unbranded_Nature-Walk.png
- http://www.cdc.gov/lyme/media/images/2026/07/NoTimeLyme_1080x1080-FB-Unbranded_Nature-Walk.png
- http://www.cdc.gov/lyme/media/images/2026/07/NoTimeLyme_1080x1350-IG-Unbranded_Nature-Walk.png
- http://www.cdc.gov/lyme/media/images/2026/07/NoTimeLyme_1200x675-X-Web-Branded_Gardening.png
- http://www.cdc.gov/lyme/media/images/2026/07/NoTimeLyme_1080x1080-FB-Branded_Gardening.png
- http://www.cdc.gov/lyme/media/images/2026/07/NoTimeLyme_1080x1350-IG-Branded_Gardening.png
- http://www.cdc.gov/lyme/media/images/2026/07/NoTimeLyme_1200x675-X-Web-Unbranded_Gardening.png
- http://www.cdc.gov/lyme/media/images/2026/07/NoTimeLyme_1080x1080-FB-Unbranded_Gardening.png
- http://www.cdc.gov/lyme/media/images/2026/07/NoTimeLyme_1080x1350-IG-Unbranded_Gardening.png
- http://www.cdc.gov/lyme/media/images/2026/07/NoTimeLyme_1200x675-X-Web-Branded_HideNSeek.png
- http://www.cdc.gov/lyme/media/images/2026/07/NoTimeLyme_1080x1080-FB-Branded_HideNSeek.png
- http://www.cdc.gov/lyme/media/images/2026/07/NoTimeLyme_1080x1350-IG-Branded_HideNSeek.png
- http://www.cdc.gov/lyme/media/images/2026/07/NoTimelyme_1200x675-X-Web-Unbranded_HideNSeek.png
| Type | Count |
|---|---|
| PDF documents | 5100 |
| Images | 613 |
| Embedded media players | 188 |
| Audio files | 110 |
| Video files | 100 |
| Presentations | 97 |
| Archives (zip, etc.) | 90 |
| Spreadsheets | 80 |
| Iframes | 67 |
| Word/text documents | 43 |