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This \u003Cstrong>HTML doctypes reference\u003C\u002Fstrong> explains the modern HTML5 doctype, older legacy doctypes, and why choosing the right doctype prevents rendering bugs across browsers.\u003C\u002Fp>\u003Ch2 id=\"what-is-a-doctype\">What Is a DOCTYPE?\u003C\u002Fh2>\u003Cp>A \u003Cstrong>doctype\u003C\u002Fstrong> (short for 'document type declaration') is not an HTML tag — it's an instruction to the browser that determines whether the page renders in \u003Cstrong>standards mode\u003C\u002Fstrong> or \u003Cstrong>quirks mode\u003C\u002Fstrong>. Without a correct doctype, browsers may render CSS and layout inconsistently.\u003C\u002Fp>\u003Ch2 id=\"1-the-modern-html5-doctype\">1. The Modern HTML5 Doctype\u003C\u002Fh2>\u003Ctable>\u003Ctr>\u003Cth>Doctype\u003C\u002Fth>\u003Cth>Description\u003C\u002Fth>\u003C\u002Ftr>\u003Ctr>\u003Ctd><!DOCTYPE html>\u003C\u002Ftd>\u003Ctd>Simple, case-insensitive doctype used for all modern HTML5 documents\u003C\u002Ftd>\u003C\u002Ftr>\u003C\u002Ftable>\u003Cp>This single line replaced the long, complex doctypes required in earlier HTML\u002FXHTML versions. It triggers \u003Cstrong>standards mode\u003C\u002Fstrong> in every modern browser.\u003C\u002Fp>\u003Ch2 id=\"2-legacy-doctypes-html-401-xhtml\">2. Legacy Doctypes (HTML 4.01 \u002F XHTML)\u003C\u002Fh2>\u003Ctable>\u003Ctr>\u003Cth>Doctype\u003C\u002Fth>\u003Cth>Description\u003C\u002Fth>\u003C\u002Ftr>\u003Ctr>\u003Ctd><!DOCTYPE HTML PUBLIC \"-\u002F\u002FW3C\u002F\u002FDTD HTML 4.01\u002F\u002FEN\" \"http:\u002F\u002Fwww.w3.org\u002FTR\u002Fhtml4\u002Fstrict.dtd\">\u003C\u002Ftd>\u003Ctd>HTML 4.01 Strict — no deprecated presentational elements allowed\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd><!DOCTYPE HTML PUBLIC \"-\u002F\u002FW3C\u002F\u002FDTD HTML 4.01 Transitional\u002F\u002FEN\" \"http:\u002F\u002Fwww.w3.org\u002FTR\u002Fhtml4\u002Floose.dtd\">\u003C\u002Ftd>\u003Ctd>HTML 4.01 Transitional — allows some deprecated tags\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd><!DOCTYPE html PUBLIC \"-\u002F\u002FW3C\u002F\u002FDTD XHTML 1.0 Strict\u002F\u002FEN\" \"http:\u002F\u002Fwww.w3.org\u002FTR\u002Fxhtml1\u002FDTD\u002Fxhtml1-strict.dtd\">\u003C\u002Ftd>\u003Ctd>XHTML 1.0 Strict — requires well-formed XML syntax\u003C\u002Ftd>\u003C\u002Ftr>\u003C\u002Ftable>\u003Ch2 id=\"3-quirks-mode-vs-standards-mode\">3. Quirks Mode vs Standards Mode\u003C\u002Fh2>\u003Ctable>\u003Ctr>\u003Cth>Mode\u003C\u002Fth>\u003Cth>Behavior\u003C\u002Fth>\u003C\u002Ftr>\u003Ctr>\u003Ctd>Standards Mode\u003C\u002Ftd>\u003Ctd>Browser renders the page according to modern web standards (triggered by <!DOCTYPE html>)\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>Quirks Mode\u003C\u002Ftd>\u003Ctd>Browser mimics old, inconsistent rendering behavior from the 1990s, often triggered by a missing or malformed doctype\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>Almost Standards Mode\u003C\u002Ftd>\u003Ctd>A middle ground used by some browsers with minor quirks in table cell sizing\u003C\u002Ftd>\u003C\u002Ftr>\u003C\u002Ftable>\u003Ch2 id=\"4-why-the-doctype-matters\">4. Why the Doctype Matters\u003C\u002Fh2>\u003Cp>Skipping the \u003Cstrong>HTML doctype\u003C\u002Fstrong> or using an outdated one can cause CSS box model calculations, table layouts, and font rendering to break unpredictably between browsers. Always place \u003Ccode><!DOCTYPE html>\u003C\u002Fcode> as the very first line of every HTML document, before the \u003Ccode><html>\u003C\u002Fcode> tag.\u003C\u002Fp>\u003Ch2 id=\"5-common-doctype-mistakes\">5. Common Doctype Mistakes\u003C\u002Fh2>\u003Ctable>\u003Ctr>\u003Cth>Mistake\u003C\u002Fth>\u003Cth>Consequence\u003C\u002Fth>\u003C\u002Ftr>\u003Ctr>\u003Ctd>Missing doctype entirely\u003C\u002Ftd>\u003Ctd>Triggers quirks mode, causing inconsistent rendering\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>Doctype placed after other tags\u003C\u002Ftd>\u003Ctd>Ignored by the browser, quirks mode is triggered\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>Using an old XHTML\u002FHTML4 doctype unnecessarily\u003C\u002Ftd>\u003Ctd>Adds unneeded strictness without HTML5 feature support\u003C\u002Ftd>\u003C\u002Ftr>\u003C\u002Ftable>\u003Ch2 id=\"try-it-yourself\">Try It Yourself\u003C\u002Fh2>\u003Cp>Use the example below to see the correct placement of a doctype declaration in a full HTML document.\u003C\u002Fp>\u003Cdiv class=\"try-it-yourself language-html\">\u003Cpre>\u003Ccode><!DOCTYPE html>\n<html lang='en'>\n<head>\n  <meta charset='UTF-8'>\n  <title>My Page<\u002Ftitle>\n<\u002Fhead>\n<body>\n  <h1>Standards Mode Page<\u002Fh1>\n  <p>This page uses the modern HTML5 doctype.<\u002Fp>\n<\u002Fbody>\n<\u002Fhtml>\u003C\u002Fcode>\u003C\u002Fpre>\u003C\u002Fdiv>\u003Cdiv class=\"try-it-yourself language-javascript\">\u003Cpre>\u003Ccode>console.log(document.compatMode);\n\u002F\u002F 'CSS1Compat' = standards mode\n\u002F\u002F 'BackCompat' = quirks mode\u003C\u002Fcode>\u003C\u002Fpre>\u003C\u002Fdiv>",{"name":15,"slug":38},{"name":325,"slug":326},{"slug":366,"display_name":367,"job_title":5,"short_bio":5,"expertise_tags":368,"headshot":5,"long_bio":5,"credentials":5,"twitter_url":5,"linkedin_url":5,"github_url":5,"personal_website_url":5,"other_sameas_urls":5,"topics":369,"posts":370},"badar-khalil","Badar Khalil",[],[],[],"Article","https:\u002F\u002Fwpfsharp.com\u002Ftopics\u002Fhtml-doctypes-reference","HTML Doctypes Reference: Complete Guide","Complete HTML doctypes reference explaining DOCTYPE declaration, HTML5 syntax, legacy doctypes, and quirks mode vs standards mode.",[376,380,384,388,392,396,400],{"id":377,"text":378,"level":12,"children":379},"what-is-a-doctype","What Is a DOCTYPE?",[],{"id":381,"text":382,"level":12,"children":383},"1-the-modern-html5-doctype","1. The Modern HTML5 Doctype",[],{"id":385,"text":386,"level":12,"children":387},"2-legacy-doctypes-html-401-xhtml","2. Legacy Doctypes (HTML 4.01 \u002F XHTML)",[],{"id":389,"text":390,"level":12,"children":391},"3-quirks-mode-vs-standards-mode","3. Quirks Mode vs Standards Mode",[],{"id":393,"text":394,"level":12,"children":395},"4-why-the-doctype-matters","4. Why the Doctype Matters",[],{"id":397,"text":398,"level":12,"children":399},"5-common-doctype-mistakes","5. Common Doctype Mistakes",[],{"id":401,"text":402,"level":12,"children":403},"try-it-yourself","Try It Yourself",[],[405,409],{"id":406,"language":16,"code":407,"is_editable":408},179,"\u003C!DOCTYPE html>\n\u003Chtml lang='en'>\n\u003Chead>\n  \u003Cmeta charset='UTF-8'>\n  \u003Ctitle>My Page\u003C\u002Ftitle>\n\u003C\u002Fhead>\n\u003Cbody>\n  \u003Ch1>Standards Mode Page\u003C\u002Fh1>\n  \u003Cp>This page uses the modern HTML5 doctype.\u003C\u002Fp>\n\u003C\u002Fbody>\n\u003C\u002Fhtml>",true,{"id":410,"language":411,"code":412,"is_editable":408},180,"javascript","console.log(document.compatMode);\n\u002F\u002F 'CSS1Compat' = standards mode\n\u002F\u002F 'BackCompat' = quirks mode",[414],{"id":185,"title":415,"slug":416,"prompt":417,"starter_code":418,"expected_output":419,"language":16,"order_index":23},"Fix the Missing Doctype","fix-missing-doctype","The HTML document below is missing its doctype declaration. Add the correct HTML5 doctype as the very first line.","\u003Chtml lang='en'>\n\u003Chead>\n  \u003Ctitle>Test Page\u003C\u002Ftitle>\n\u003C\u002Fhead>\n\u003Cbody>\n  \u003Cp>Hello World\u003C\u002Fp>\n\u003C\u002Fbody>\n\u003C\u002Fhtml>","The document starts with \u003C!DOCTYPE html> followed by the existing markup.","2026-09-27T19:51:11+00:00",{"id":341,"slug":343,"title":342},{"id":349,"slug":351,"title":350}]