How Can You Tell What’s Allowed Inside Each HTML Element? Dec 31, 2025 174 html The Two Most Important Tools for HTML Developers Dec 22, 2025 173 tooling , html , minification , html-minifier What’s Wrong With This HTML, and Is It Valid? pat /mat )Dec 8, 2025 172 html , standards , web-platform HTML—the Most Difficult Programming Language in the World j9t )Oct 9, 2025 171 programming , html , professionalism Understanding the Removal of 4.1.1 Parsing in WCAG 2.2 tpg )Oct 1, 2025 170 accessibility , wcag , html 2025: 0 of the Global Top 200 Websites Use Valid HTML j9t )Sep 10, 2025 169 html , metrics , quality , craft Conformance vs. Compliance, Accessibility Standards Edition hdv )Aug 12, 2025 168 accessibility , standards , compliance , terminology , comparisons , wcag When HTML Speaks Clearly Aug 6, 2025 167 html , accessibility , semantics Why and How to Write Minimal and Valid HTML, a Link Guide j9t )Jul 24, 2025 166 html , minimalism , how-tos , guides , link-lists Google: Many Top Sites Have Invalid HTML and Still Rank mat /sea )Jun 30, 2025 165 google , html , quality , seo How Often Should We Speak About HTML Conformance? j9t )May 14, 2025 164 html , metrics Mastering HTML: The Art of Minimal and Valid Code in Professional Web Development (AI Edition) j9t )Apr 23, 2025 163 guest-posts , html , minimalism , semantics , interoperability , accessibility , standards A Review of HTML Linters Mar 17, 2025 162 overviews , html , linting , tooling , link-lists , comparisons DeepSeek and HTML j9t )Mar 7, 2025 161 ai , html , minimalism Testing 10 JavaScript Frameworks on Their HTML Defaults j9t )Feb 12, 2025 160 frameworks , javascript , html , comparisons , link-lists HTML Conformance: A Comparison of 6.5 npm Validator Packages (With 1.5 Recommendations) j9t )Dec 17, 2024 159 html , tooling , npm , comparisons Where Has All the Valid HTML Gone j9t )Nov 21, 2024 158 html , quality 2024: 0.5% of the Global Top 200 Websites Use Valid HTML j9t )Sep 11, 2024 157 html , metrics , quality , craft Test-Driving HTML Templates xpm /mfo )May 21, 2024 156 html , templates , testing , server-side-rendering We Need to Talk More About Conformance, if We Want to Stop Fantasy HTML j9t )May 21, 2024 155 html , craft , quality Level-Setting Heading Levels aar )May 8, 2024 154 headings , semantics , accessibility , aria Upgrade Your HTML V j9t /fro )May 8, 2024 153 books , frontend-dogma , html , minimalism , craft 9 Signs Your Frontend Code Has Quality Issues That Affect Your Users ang )Apr 13, 2024 152 quality , craft , accessibility , usability , user-experience , performance Complete a VPAT: Show How Accessible Your Product Is deq )Apr 11, 2024 151 accessibility , vpat-acr , documentation How-To: 5 Steps to Detect Invalid HTML Breaking Your [Site’s Performance] erw )Apr 2, 2024 150 how-tos , html , performance How Invalid HTML Elements Impact Web Performance erw )Mar 26, 2024 149 html , performance My Web Development Wishlist 2024 j9t )Jan 7, 2024 148 community , user-experience , developer-experience , quality , wish-lists HTML Validation—Pros and Cons Dec 27, 2023 147 html The Top Accessibility Errors Found in 2023 tpg )Dec 21, 2023 146 accessibility , quality , errors , retrospectives Do You Really Need to Validate Your HTML Code? Nov 11, 2023 145 discussions , html 2023: 0 of the Global Top 100 Websites Use Valid HTML j9t )Oct 31, 2023 144 html , css , metrics , quality Why Unique ID Attributes Matter deq )Oct 19, 2023 143 accessibility , html , attributes On the Uniting Power of a Commitment to HTML Conformance j9t )Oct 18, 2023 142 html , quality , community , web Welcome WCAG 2.2 and Goodbye Success Criterion 4.1.1 “Parsing” cer )Oct 7, 2023 141 accessibility , wcag WCAG 2.2 and Validation Oct 6, 2023 140 accessibility , wcag , quality The Most Minimal Valid HTML Document j9t )Oct 2, 2023 139 html , minimalism , templates User Input Sanitization and Validation: Securing Your App Jul 19, 2023 138 security , sanitization , validation How to Validate HTML On-Line at W3C wie )Jul 5, 2023 137 how-tos , html , tooling Resources for Procurement of Accessible Digital Products and VPAT den )Jul 5, 2023 136 accessibility , vpat-acr , tooling , link-lists Meeting WCAG Level AAA pat /tet )Apr 21, 2023 135 accessibility , wcag , standards A Quick Guide to Reviewing a VPAT ACR kar )Mar 27, 2023 134 accessibility , vpat-acr , auditing Conformance and Accessibility j9t )Feb 28, 2023 133 accessibility , quality The Troublesome Life and Lamentable Death of Success Criterion 4.1.1 Feb 9, 2023 132 accessibility , wcag , standards Enforcing Better HTML Markup With Eleventy mat )Dec 23, 2022 131 html , semantics , eleventy Upgrade Your HTML IV j9t /fro )Nov 27, 2022 130 books , frontend-dogma , html , minimalism , craft Two Things I Learned by Validating My HTML Again Sep 24, 2022 129 html , lessons Invalid CSS cit )Sep 15, 2022 128 css 2022: 0 of the Global Top 100 Websites Use Valid HTML j9t )Sep 12, 2022 127 html , css , metrics , quality , craft Icon-Only Links Fail WCAG tem )Jun 20, 2022 126 accessibility , links , wcag , images , icons Top 2021 CSS Frameworks Report: Validation cit )May 6, 2022 125 studies , research , frameworks , css , quality Does Valid and Semantic HTML Still Matter? 5t3 +)Apr 18, 2022 124 podcasts , html , semantics Understanding the W3C’s Accessibility Conformance Testing (ACT) Requirements Feb 4, 2022 123 accessibility , testing Web Accessibility Lawsuits Dramatically Rose in 2021 Jan 12, 2022 122 accessibility , legal WCAG and Accessibility: What Is a Statement of Partial Conformance? Dec 29, 2021 121 accessibility , wcag The 3-Second Frontend Developer Test j9t )Jul 14, 2021 120 html , css , quality Why Validate? j9t )Jun 9, 2021 119 html , css , quality , craft 2021: 98% of the Top 100 U.S. Websites Use Invalid HTML j9t )May 18, 2021 118 html , css , metrics , quality , craft Upgrade Your HTML III j9t /fro )May 13, 2021 117 books , frontend-dogma , html , minimalism , craft Upgrade Your HTML II j9t /fro )Nov 17, 2020 116 books , frontend-dogma , html , minimalism , craft Upgrade Your HTML (the Booklet) j9t )Nov 4, 2019 115 books , html , minimalism , craft No EPUBCheck, no EPUB w3c )Feb 12, 2019 114 epub , tooling JSON Validation by Committee Aug 31, 2015 113 ruby , json , validation A Vision of Web Development j9t )May 13, 2015 112 outlooks , minimalism , semantics , maintainability 10 Typical HTML Interview Exercises Nov 25, 2014 111 html , interviewing , semantics , aria Getting Started With HTML5 Apr 26, 2013 110 introductions , html , browsers , code-editors , dev-tools Google HTML/CSS Style Guide j9t )Apr 25, 2012 109 google , html , css , style-guides , quality , principles , formatting , naming , sorting New W3C Validation Service With RDFa 1.1 and Microdata iva /w3c )Feb 8, 2012 108 w3c , tooling , html , rdf , microdata Validation: Measuring and Tracking Code Quality j9t )Jul 11, 2011 107 html , css , quality , metrics But It Doesn’t Validate Nov 22, 2010 106 html , css , vendor-extensions The Value of HTML Validation nza )Aug 17, 2010 105 html CSS Validation and Vendor Extensions: Throw Warnings, Not Errors j9t )Jun 26, 2010 104 css , vendor-extensions W3C Validation: It’s Not Just About Rankings Nov 12, 2009 103 w3c , html , css , tooling , seo Let’s Make Every Day One Web Day! w3c )Sep 22, 2009 102 awareness-days , web , accessibility , internationalization , mobile Absent Elements and Validation htm )Aug 25, 2009 101 html , attributes 10 Ways to Make Your XHTML Site Accessible Using Web Standards mri /sma )Jun 18, 2009 100 xhtml , accessibility , standards 14 Free Tools to Validate Your HTML, CSS, and RSS Feeds sea )May 29, 2009 99 html , css , rss , tooling , link-lists When Good Browsers Go Bad—and They All Do com )Feb 24, 2009 98 standards , support , internet-explorer , microsoft , browsers The Two Great Things About Validation (and Conformance) j9t )Jan 30, 2009 97 html , css , quality , craft Valid Sites Work Better (?) w3c )Jan 29, 2009 96 html , css HTML 5: Document Conformance w3c )Dec 16, 2008 95 html W3C Validators in Jeopardy mho )Dec 11, 2008 94 w3c , tooling W3C Markup Validation Service Adds Experimental HTML5 Support Nov 25, 2008 93 w3c , tooling , html W3C Validator, Now With HTML5 Flavour oli /w3c )Nov 21, 2008 92 w3c , html , tooling Five HTML Oddities That You May Not Know Nov 14, 2008 91 html , browsers 12 Principles for Clean HTML Code chr /sma )Nov 12, 2008 90 html , principles , encoding , formatting , naming , css Opera Study: Only 4.13% of the Web Is Standards-Compliant ars )Oct 16, 2008 89 studies , research , opera , standards , semantics Where Our Standards Went Wrong bee /ali )Sep 22, 2008 88 standards , quality When Validation Becomes Unimportant j9t )Jun 16, 2008 87 html , css , optimization , craft Using Flash and Staying Standards Compliant chr /css )May 26, 2008 86 flash , embed-code , jquery Conforming “target” Attribute lac )Apr 30, 2008 85 html , attributes , pop-ups A Validator Is Not an Accessibility Evaluation Tool? w3c )Apr 14, 2008 84 discussions , html , accessibility , alt-text , images , tooling Google Can’t Code Nov 28, 2007 83 google , html , quality What Beautiful HTML Code Looks Like chr /css )Nov 1, 2007 82 html , attributes , semantics , formatting The Craft of HTML kar /w3c )Aug 8, 2007 81 html , craft Top Blogs Fail W3C Markup Validation bpe )Aug 6, 2007 80 html , metrics Fixing the Web… Together! kar /w3c )Jun 15, 2007 79 html , xhtml , css , standards , quality An HTML5 Conformance Checker hsi )May 7, 2007 78 studies , html , parsing , history “Valid CSS” and Similar Claims Are Unprofessional j9t )Mar 9, 2007 77 html , css , wcag , professionalism Validator Web Service Interface Ideas hsi )Dec 14, 2006 76 web-services , tooling W3C Markup Validator, Link Checker Updated Oct 28, 2006 75 w3c , html , xhtml , links , link-rot , user-experience , tooling Bulletproof HTML: 37 Steps to Perfect Markup Oct 25, 2006 74 html , xhtml , encoding , unicode , character-references , semantics Unicorn Sighting (Public Preview) don /w3c )Sep 7, 2006 73 w3c , tooling , quality The Web Accessibility Myth in the UK Jul 24, 2006 72 accessibility , wcag , compliance , html , css , myths Following the XHTML Path Jul 12, 2006 71 xhtml , link-lists Why Comply? The Movement to W3C Compliance Mar 31, 2006 70 w3c , standards Buy Standards Compliant Web Sites kar /w3c )Feb 7, 2006 69 standards , compliance , professionalism , economics New W3C Feed Validation Service oli )Nov 21, 2005 68 discussions , w3c , syndication , rss , atom , tooling Character References Explained lac )Oct 10, 2005 67 html , unicode , character-references Ten Steps to a More User Friendly Website Sep 14, 2005 66 flash , performance , images , compression , link-rot , html , browsers , support , navigation , readability , quality Validation Quiz Explanation lac )May 19, 2005 65 quizzes , html , xhtml , xml Markup Content Models ann )May 5, 2005 64 html Character Encodings and Input Apr 19, 2005 63 unicode , character-references , php Ampersands, PHP Sessions, and Valid HTML w3c )Apr 15, 2005 62 html , php , character-references On Valid CSS ann )Mar 13, 2005 61 css Validating a Custom DTD jde /ali )Feb 1, 2005 60 xhtml The Four Essentials of Modern Web Design Oct 27, 2004 59 fundamentals , accessibility , semantics , principles , quality Quick Guide to XHTML ann )Aug 19, 2004 58 guides , xhtml , html , mime-types , unicode XHTML Is Invalid HTML ann )Jun 13, 2004 57 xhtml , html CSS Validation dav )Feb 5, 2004 56 css Error Handling and Web Language Design Jan 22, 2004 55 errors , standards , html This Validates sim )Aug 27, 2003 54 semantics , xhtml On Standards and Semantics sto )Aug 26, 2003 53 standards , semantics Semantics and Bad Code dav )Aug 26, 2003 52 html , xhtml , semantics Standards Don’t Necessarily Have Anything to Do With Being Semantically Correct kot )Aug 26, 2003 51 standards , semantics , html , xhtml , css URLs vs. XHTML dav )Feb 17, 2003 50 urls , xhtml Effects of CSS-Based Design dav )Dec 12, 2002 49 html , css , performance W3C Updates Validation Service Nov 28, 2002 48 html , xhtml , xml , tooling , w3c W3C Members: What Standards? zdn )Sep 6, 2002 47 w3c , html , quality , standards Valid Garbage In, Valid Garbage Out: Answers Aug 18, 2002 46 html , semantics Buy Standards Compliant Web Sites don /w3c )Jul 4, 2002 45 standards , compliance , maintainability , accessibility , business-relations , economics Anil Dash Does Amazon sim )Jun 15, 2002 44 html , case-studies Valid Garbage In, Valid Garbage Out May 25, 2002 43 html , css Better Living Through XHTML zel /ali )Feb 15, 2002 42 xhtml , html HTML Syntax Checker in PHP hsi )Jan 30, 2002 41 html , php , tooling Any Browser vs. WaSP—Battle of the Purists Aug 25, 2001 40 html , netscape , browsers , web-standards-project “Forgiving” Browsers Considered Harmful jde /ali )Apr 27, 2001 39 html , xhtml , wysiwyg , parsing Validating XML in Internet Explorer Nov 14, 2000 38 xml , microsoft , internet-explorer Conformance Testing for XML Processors Sep 15, 1999 37 xml , testing Purism vs. Layout—the Holy War Dec 31, 1998 36 layout , html , sgml , outlooks Validators Sep 24, 1998 35 html , quality , tooling , link-lists AMP Validator 34 tools , analysis , amp , google CSS Validator w3c )33 tools , analysis , css DAML Validator 32 tools , analysis Facebook Validator 31 tools , analysis , facebook+meta hCard Validator 30 tools , analysis , microformats HTML Validator w3c )29 tools , analysis , html LinkedIn Validator 28 tools , analysis , social-media P3P Validator w3c )27 tools , analysis , privacy , p3p robots.txt Validator (Merkle) max )26 tools , analysis , seo , robotstxt RSS and Atom Feed Validator w3c )25 tools , analysis , syndication , rss , atom SBML Validator 24 tools , analysis Sitemap Validator 23 tools , analysis , sitemaps SVG Validator 22 tools , analysis , svg XML-RPC Validator 21 tools , analysis , xml XML Schema Validator 20 tools , analysis , xml XML Validator 19 tools , analysis , xml XML Well-Formedness Checker and Validator 18 tools , analysis , xml Content Security Policy Validator (CSP Validator) 17 tools , analysis , security , csp Content Security Policy Validator (Google) 16 tools , analysis , security , csp Unquoted Attribute Value Validator mat )15 tools , exploration , auditing , debugging , html , attributes HTML Nesting Checker 14 tools , exploration , optimization , html , nesting JSON Validator (FreeFormatter.com) 13 tools , exploration , optimization , json JSON Validator (JSONCompare) 12 tools , exploration , optimization , json YAML Validator 11 tools , exploration , optimization , yaml ISBN Checker and Formatter 10 tools , exploration AMP Bulk Validator max )9 tools , analysis , amp , google JavaScript Validator 8 tools , exploration , optimization , javascript WebVTT Validator w3c )7 tools , exploration , optimization , captions , accessibility JavaScript Variable Name Validator mat )6 tools , exploration , optimization , javascript SHACL Validator 5 tools , analysis , structured-data Design Token Validator and )4 tools , exploration , optimization , design-tokens robots.txt Validator (Logeix) 3 tools , analysis , seo , robotstxt EPUB Validator 2 tools , exploration , epub Twitter/X Validator 1 tools , analysis , social-media , twitter+x 