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A \u003Cstrong>pseudo-element\u003C\u002Fstrong> (double colon, such as \u003Ccode>::before\u003C\u002Fcode>) selects a \u003Cem>part\u003C\u002Fem> of an element or creates a virtual child. The double-colon syntax was introduced in CSS3 to tell them apart. 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Set \u003Ccode>display: block\u003C\u002Fcode>, \u003Ccode>inline-block\u003C\u002Fcode> or \u003Ccode>position: absolute\u003C\u002Fcode> to control layout.\u003C\u002Fli>\u003Cli>They will \u003Cstrong>not render unless the \u003Ccode>content\u003C\u002Fcode> property is set\u003C\u002Fstrong>. Even an empty string works: \u003Ccode>content: '';\u003C\u002Fcode>.\u003C\u002Fli>\u003Cli>They do not work on replaced elements such as \u003Ccode><img>\u003C\u002Fcode>, \u003Ccode><input>\u003C\u002Fcode>, \u003Ccode><br>\u003C\u002Fcode> because these have no content box to place children in.\u003C\u002Fli>\u003Cli>They cannot be selected by JavaScript with \u003Ccode>querySelector\u003C\u002Fcode>, but you can read them with \u003Ccode>getComputedStyle(el, '::before')\u003C\u002Fcode>.\u003C\u002Fli>\u003C\u002Ful>\u003Ch2 id=\"the-content-property\">The content Property\u003C\u002Fh2>\u003Cp>The \u003Ccode>content\u003C\u002Fcode> property accepts several kinds of values:\u003C\u002Fp>\u003Cul>\u003Cli>A string: \u003Ccode>content: 'New';\u003C\u002Fcode>\u003C\u002Fli>\u003Cli>An empty string for purely decorative shapes: \u003Ccode>content: '';\u003C\u002Fcode>\u003C\u002Fli>\u003Cli>An attribute value: \u003Ccode>content: attr(data-label);\u003C\u002Fcode>\u003C\u002Fli>\u003Cli>A counter: \u003Ccode>content: counter(item) '. ';\u003C\u002Fcode>\u003C\u002Fli>\u003Cli>An image: \u003Ccode>content: url(icon.svg);\u003C\u002Fcode>\u003C\u002Fli>\u003Cli>Quote keywords: \u003Ccode>open-quote\u003C\u002Fcode> and \u003Ccode>close-quote\u003C\u002Fcode>\u003C\u002Fli>\u003C\u002Ful>\u003Ch2 id=\"real-world-use-cases\">Real-world Use Cases\u003C\u002Fh2>\u003Ch3 id=\"1-decorative-icons-and-badges\">1. Decorative icons and badges\u003C\u002Fh3>\u003Cp>Add a small 'NEW' badge or an arrow icon after a link without touching the HTML markup. This keeps your HTML semantic and clean.\u003C\u002Fp>\u003Ch3 id=\"2-tooltips-without-javascript\">2. Tooltips without JavaScript\u003C\u002Fh3>\u003Cp>Combine \u003Ccode>attr(data-tip)\u003C\u002Fcode>, \u003Ccode>position: absolute\u003C\u002Fcode> and \u003Ccode>:hover\u003C\u002Fcode> to display a pure-CSS tooltip. This is one of the most searched CSS tricks.\u003C\u002Fp>\u003Ch3 id=\"3-gradient-overlays-on-images-or-cards\">3. Gradient overlays on images or cards\u003C\u002Fh3>\u003Cp>Use \u003Ccode>::after\u003C\u002Fcode> with \u003Ccode>position: absolute; inset: 0;\u003C\u002Fcode> and a \u003Ccode>linear-gradient\u003C\u002Fcode> to darken the bottom of a card so white text stays readable.\u003C\u002Fp>\u003Ch3 id=\"4-clearfix\">4. Clearfix\u003C\u002Fh3>\u003Cp>Before Flexbox and Grid, the clearfix hack used \u003Ccode>::after\u003C\u002Fcode> with \u003Ccode>clear: both\u003C\u002Fcode> to make a parent contain floated children. You will still meet it in legacy code.\u003C\u002Fp>\u003Ch3 id=\"5-custom-shapes\">5. Custom shapes\u003C\u002Fh3>\u003Cp>Triangles, ribbons, speech-bubble tails and decorative lines are all built with empty pseudo-elements and borders or gradients.\u003C\u002Fp>\u003Ch2 id=\"other-useful-pseudo-elements\">Other Useful Pseudo-elements\u003C\u002Fh2>\u003Ctable>\u003Cthead>\u003Ctr>\u003Cth>Pseudo-element\u003C\u002Fth>\u003Cth>What it styles\u003C\u002Fth>\u003C\u002Ftr>\u003C\u002Fthead>\u003Ctbody>\u003Ctr>\u003Ctd>\u003Ccode>::first-letter\u003C\u002Fcode>\u003C\u002Ftd>\u003Ctd>First letter of a block (drop caps)\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>\u003Ccode>::first-line\u003C\u002Fcode>\u003C\u002Ftd>\u003Ctd>First formatted line of a block\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>\u003Ccode>::selection\u003C\u002Fcode>\u003C\u002Ftd>\u003Ctd>Text highlighted by the user\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>\u003Ccode>::placeholder\u003C\u002Fcode>\u003C\u002Ftd>\u003Ctd>Placeholder text in inputs\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>\u003Ccode>::marker\u003C\u002Fcode>\u003C\u002Ftd>\u003Ctd>Bullet or number of a list item\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>\u003Ccode>::backdrop\u003C\u002Fcode>\u003C\u002Ftd>\u003Ctd>Background behind a \u003Ccode><dialog>\u003C\u002Fcode> or fullscreen element\u003C\u002Ftd>\u003C\u002Ftr>\u003Ctr>\u003Ctd>\u003Ccode>::file-selector-button\u003C\u002Fcode>\u003C\u002Ftd>\u003Ctd>The button inside \u003Ccode>input type='file'\u003C\u002Fcode>\u003C\u002Ftd>\u003C\u002Ftr>\u003C\u002Ftbody>\u003C\u002Ftable>\u003Cp>Modern CSS also introduces \u003Ccode>::view-transition\u003C\u002Fcode> pseudo-elements for the View Transitions API, and \u003Ccode>::highlight()\u003C\u002Fcode> for the CSS Custom Highlight API. These are newer and browser support should be checked before production use.\u003C\u002Fp>\u003Ch2 id=\"accessibility-considerations\">Accessibility Considerations\u003C\u002Fh2>\u003Cul>\u003Cli>Generated content may be announced by some screen readers, and it cannot be selected or copied. Never place essential information only in \u003Ccode>::before\u003C\u002Fcode> or \u003Ccode>::after\u003C\u002Fcode>.\u003C\u002Fli>\u003Cli>For decorative icons you can provide alternative text using the modern syntax \u003Ccode>content: url(icon.svg) \u002F '';\u003C\u002Fcode> which marks the content as decorative in supporting browsers.\u003C\u002Fli>\u003Cli>Do not rely on pseudo-element text for SEO. Search engines treat it as presentation, not content.\u003C\u002Fli>\u003C\u002Ful>\u003Ch2 id=\"best-practices\">Best Practices\u003C\u002Fh2>\u003Cul>\u003Cli>Use pseudo-elements for \u003Cem>decoration\u003C\u002Fem>, not for meaningful content.\u003C\u002Fli>\u003Cli>Set \u003Ccode>position: relative\u003C\u002Fcode> on the parent when the pseudo-element uses \u003Ccode>position: absolute\u003C\u002Fcode>.\u003C\u002Fli>\u003Cli>Use \u003Ccode>pointer-events: none\u003C\u002Fcode> on overlay pseudo-elements so they do not block clicks.\u003C\u002Fli>\u003Cli>Keep a consistent naming approach and comment complex shape tricks for teammates.\u003C\u002Fli>\u003Cli>Prefer \u003Ccode>inset: 0\u003C\u002Fcode> over the four-property shorthand \u003Ccode>top\u002Fright\u002Fbottom\u002Fleft\u003C\u002Fcode> in modern projects.\u003C\u002Fli>\u003C\u002Ful>\u003Ch2 id=\"common-mistakes\">Common Mistakes\u003C\u002Fh2>\u003Cul>\u003Cli>Forgetting \u003Ccode>content\u003C\u002Fcode>, so nothing appears.\u003C\u002Fli>\u003Cli>Trying to add \u003Ccode>::before\u003C\u002Fcode> to an \u003Ccode><img>\u003C\u002Fcode> or \u003Ccode><input>\u003C\u002Fcode>.\u003C\u002Fli>\u003Cli>Forgetting \u003Ccode>position: relative\u003C\u002Fcode> on the parent, so the pseudo-element flies to the wrong place.\u003C\u002Fli>\u003Cli>Placing an overlay on top of a link without \u003Ccode>pointer-events: none\u003C\u002Fcode>, making the link unclickable.\u003C\u002Fli>\u003Cli>Using a single colon for newer pseudo-elements such as \u003Ccode>:marker\u003C\u002Fcode>, which is invalid.\u003C\u002Fli>\u003C\u002Ful>\u003Ch2 id=\"summary\">Summary\u003C\u002Fh2>\u003Cp>CSS pseudo-elements let you add visual polish without extra markup. Master \u003Ccode>::before\u003C\u002Fcode> and \u003Ccode>::after\u003C\u002Fcode>, always set \u003Ccode>content\u003C\u002Fcode>, position them deliberately, and keep them decorative. Try the interactive examples below and edit them live.\u003C\u002Fp>\u003Cdiv class=\"try-it-yourself language-html\">\u003Cpre>\u003Ccode><style>\n  .link-new { position: relative; font-family: sans-serif; font-size: 20px; color: #2563eb; text-decoration: none; }\n  .link-new::after { content: 'NEW'; margin-left: 8px; padding: 2px 8px; font-size: 12px; font-weight: bold; color: #fff; background: #ef4444; border-radius: 999px; vertical-align: middle; }\n  .link-external::before { content: '\\2192 '; }\n<\u002Fstyle>\n<p><a class='link-new' href='#'>Latest CSS Course<\u002Fa><\u002Fp>\n<p><a class='link-external' href='#'>External Resource<\u002Fa><\u002Fp>\u003C\u002Fcode>\u003C\u002Fpre>\u003C\u002Fdiv>\u003Cdiv class=\"try-it-yourself language-html\">\u003Cpre>\u003Ccode><style>\n  .tip { position: relative; display: inline-block; padding: 10px 16px; background: #1e293b; color: #fff; font-family: sans-serif; border-radius: 6px; cursor: help; margin: 50px; }\n  .tip::after { content: attr(data-tip); position: absolute; bottom: 120%; left: 50%; transform: translateX(-50%); background: #0f172a; color: #fff; padding: 6px 10px; border-radius: 4px; font-size: 13px; white-space: nowrap; opacity: 0; pointer-events: none; transition: opacity .2s; }\n  .tip::before { content: ''; position: absolute; bottom: 110%; left: 50%; transform: translateX(-50%); border: 6px solid transparent; border-top-color: #0f172a; opacity: 0; transition: opacity .2s; }\n  .tip:hover::after, .tip:hover::before { opacity: 1; }\n<\u002Fstyle>\n<span class='tip' data-tip='Pure CSS tooltip, no JavaScript!'>Hover over me<\u002Fspan>\u003C\u002Fcode>\u003C\u002Fpre>\u003C\u002Fdiv>\u003Cdiv class=\"try-it-yourself language-html\">\u003Cpre>\u003Ccode><style>\n  .card { position: relative; width: 300px; height: 200px; border-radius: 12px; overflow: hidden; background: linear-gradient(135deg, #22c55e, #3b82f6); font-family: sans-serif; }\n  .card::after { content: ''; position: absolute; inset: 0; background: linear-gradient(to top, rgba(0,0,0,.75), transparent 60%); pointer-events: none; }\n  .card h3 { position: absolute; left: 16px; bottom: 12px; margin: 0; color: #fff; z-index: 1; }\n<\u002Fstyle>\n<div class='card'><h3>Readable Title Over Image<\u002Fh3><\u002Fdiv>\u003C\u002Fcode>\u003C\u002Fpre>\u003C\u002Fdiv>\u003Cdiv class=\"try-it-yourself language-html\">\u003Cpre>\u003Ccode><style>\n  article { font-family: Georgia, serif; max-width: 420px; line-height: 1.6; }\n  article p:first-of-type::first-letter { float: left; font-size: 3.2em; line-height: .9; padding-right: 8px; color: #b91c1c; font-weight: bold; }\n  article ::selection { background: #fde047; color: #111; }\n  ul.custom li::marker { color: #2563eb; font-size: 1.2em; }\n  input::placeholder { color: #94a3b8; font-style: italic; }\n<\u002Fstyle>\n<article>\n  <p>Drop caps make long articles feel editorial. Select this text to see the custom highlight color.<\u002Fp>\n  <ul class='custom'><li>Styled marker one<\u002Fli><li>Styled marker two<\u002Fli><\u002Ful>\n  <input placeholder='Styled placeholder text'>\n<\u002Farticle>\u003C\u002Fcode>\u003C\u002Fpre>\u003C\u002Fdiv>\u003Cdiv class=\"try-it-yourself language-html\">\u003Cpre>\u003Ccode><style>\n  .clearfix::after { content: ''; display: table; clear: both; }\n  .box { border: 2px solid #334155; padding: 8px; }\n  .float { float: left; width: 80px; height: 80px; background: #f97316; margin: 4px; }\n<\u002Fstyle>\n<div class='box clearfix'><div class='float'><\u002Fdiv><div class='float'><\u002Fdiv><\u002Fdiv>\n<p>The bordered box now contains its floated children thanks to ::after.<\u002Fp>\u003C\u002Fcode>\u003C\u002Fpre>\u003C\u002Fdiv>",{"name":9,"slug":10},{"name":423,"slug":424},{"slug":464,"display_name":465,"job_title":5,"short_bio":5,"expertise_tags":466,"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":467,"posts":468},"badar-khalil","Badar Khalil",[],[],[],"Article","https:\u002F\u002Fwpfsharp.com\u002Ftopics\u002Fcss-pseudo-elements-before-after","CSS Pseudo-elements: ::before and ::after Guide","Learn CSS pseudo-elements ::before and ::after with live examples: icons, badges, overlays, clearfix, tooltips and best practices.",[474,478,482,486,490,514,518,522,526,530],{"id":475,"text":476,"level":12,"children":477},"what-are-css-pseudo-elements","What Are CSS Pseudo-elements?",[],{"id":479,"text":480,"level":12,"children":481},"pseudo-class-vs-pseudo-element","Pseudo-class vs Pseudo-element",[],{"id":483,"text":484,"level":12,"children":485},"how-before-and-after-work","How ::before and ::after Work",[],{"id":487,"text":488,"level":12,"children":489},"the-content-property","The content Property",[],{"id":491,"text":492,"level":12,"children":493},"real-world-use-cases","Real-world Use Cases",[494,498,502,506,510],{"id":495,"text":496,"level":57,"children":497},"1-decorative-icons-and-badges","1. Decorative icons and badges",[],{"id":499,"text":500,"level":57,"children":501},"2-tooltips-without-javascript","2. Tooltips without JavaScript",[],{"id":503,"text":504,"level":57,"children":505},"3-gradient-overlays-on-images-or-cards","3. Gradient overlays on images or cards",[],{"id":507,"text":508,"level":57,"children":509},"4-clearfix","4. Clearfix",[],{"id":511,"text":512,"level":57,"children":513},"5-custom-shapes","5. Custom shapes",[],{"id":515,"text":516,"level":12,"children":517},"other-useful-pseudo-elements","Other Useful Pseudo-elements",[],{"id":519,"text":520,"level":12,"children":521},"accessibility-considerations","Accessibility Considerations",[],{"id":523,"text":524,"level":12,"children":525},"best-practices","Best Practices",[],{"id":527,"text":528,"level":12,"children":529},"common-mistakes","Common Mistakes",[],{"id":531,"text":532,"level":12,"children":533},"summary","Summary",[],[535,539,542,545,548],{"id":536,"language":16,"code":537,"is_editable":538},234,"\u003Cstyle>\n  .link-new { position: relative; font-family: sans-serif; font-size: 20px; color: #2563eb; text-decoration: none; }\n  .link-new::after { content: 'NEW'; margin-left: 8px; padding: 2px 8px; font-size: 12px; font-weight: bold; color: #fff; background: #ef4444; border-radius: 999px; vertical-align: middle; }\n  .link-external::before { content: '\\2192 '; }\n\u003C\u002Fstyle>\n\u003Cp>\u003Ca class='link-new' href='#'>Latest CSS Course\u003C\u002Fa>\u003C\u002Fp>\n\u003Cp>\u003Ca class='link-external' href='#'>External Resource\u003C\u002Fa>\u003C\u002Fp>",true,{"id":540,"language":16,"code":541,"is_editable":538},235,"\u003Cstyle>\n  .tip { position: relative; display: inline-block; padding: 10px 16px; background: #1e293b; color: #fff; font-family: sans-serif; border-radius: 6px; cursor: help; margin: 50px; }\n  .tip::after { content: attr(data-tip); position: absolute; bottom: 120%; left: 50%; transform: translateX(-50%); background: #0f172a; color: #fff; padding: 6px 10px; border-radius: 4px; font-size: 13px; white-space: nowrap; opacity: 0; pointer-events: none; transition: opacity .2s; }\n  .tip::before { content: ''; position: absolute; bottom: 110%; left: 50%; transform: translateX(-50%); border: 6px solid transparent; border-top-color: #0f172a; opacity: 0; transition: opacity .2s; }\n  .tip:hover::after, .tip:hover::before { opacity: 1; }\n\u003C\u002Fstyle>\n\u003Cspan class='tip' data-tip='Pure CSS tooltip, no JavaScript!'>Hover over me\u003C\u002Fspan>",{"id":543,"language":16,"code":544,"is_editable":538},236,"\u003Cstyle>\n  .card { position: relative; width: 300px; height: 200px; border-radius: 12px; overflow: hidden; background: linear-gradient(135deg, #22c55e, #3b82f6); font-family: sans-serif; }\n  .card::after { content: ''; position: absolute; inset: 0; background: linear-gradient(to top, rgba(0,0,0,.75), transparent 60%); pointer-events: none; }\n  .card h3 { position: absolute; left: 16px; bottom: 12px; margin: 0; color: #fff; z-index: 1; }\n\u003C\u002Fstyle>\n\u003Cdiv class='card'>\u003Ch3>Readable Title Over Image\u003C\u002Fh3>\u003C\u002Fdiv>",{"id":546,"language":16,"code":547,"is_editable":538},237,"\u003Cstyle>\n  article { font-family: Georgia, serif; max-width: 420px; line-height: 1.6; }\n  article p:first-of-type::first-letter { float: left; font-size: 3.2em; line-height: .9; padding-right: 8px; color: #b91c1c; font-weight: bold; }\n  article ::selection { background: #fde047; color: #111; }\n  ul.custom li::marker { color: #2563eb; font-size: 1.2em; }\n  input::placeholder { color: #94a3b8; font-style: italic; }\n\u003C\u002Fstyle>\n\u003Carticle>\n  \u003Cp>Drop caps make long articles feel editorial. Select this text to see the custom highlight color.\u003C\u002Fp>\n  \u003Cul class='custom'>\u003Cli>Styled marker one\u003C\u002Fli>\u003Cli>Styled marker two\u003C\u002Fli>\u003C\u002Ful>\n  \u003Cinput placeholder='Styled placeholder text'>\n\u003C\u002Farticle>",{"id":549,"language":16,"code":550,"is_editable":538},238,"\u003Cstyle>\n  .clearfix::after { content: ''; display: table; clear: both; }\n  .box { border: 2px solid #334155; padding: 8px; }\n  .float { float: left; width: 80px; height: 80px; background: #f97316; margin: 4px; }\n\u003C\u002Fstyle>\n\u003Cdiv class='box clearfix'>\u003Cdiv class='float'>\u003C\u002Fdiv>\u003Cdiv class='float'>\u003C\u002Fdiv>\u003C\u002Fdiv>\n\u003Cp>The bordered box now contains its floated children thanks to ::after.\u003C\u002Fp>",{"id":169,"slug":552,"title":553,"time_limit_seconds":5,"pass_percentage":329,"question_count":65},"pseudo-elements-quiz","Pseudo-elements Quiz",[555,561],{"id":403,"title":556,"slug":557,"prompt":558,"starter_code":559,"expected_output":560,"language":16,"order_index":23},"Add a Required Star to Labels","required-label-star","Using only CSS, make every label that has the class 'required' show a red asterisk after its text. Use the ::after pseudo-element and the content property. Do not change the HTML.","\u003Cstyle>\n  \u002F* Write your CSS here *\u002F\n\u003C\u002Fstyle>\n\u003Clabel class='required'>Full Name\u003C\u002Flabel>\n\u003Cbr>\n\u003Clabel class='required'>Email\u003C\u002Flabel>","Each label displays a red * immediately after the text.",{"id":407,"title":562,"slug":563,"prompt":564,"starter_code":565,"expected_output":566,"language":16,"order_index":12},"Build a Pure CSS Ribbon","css-ribbon-badge","Create a small 'SALE' ribbon in the top-right corner of a product box using ::before. The box must have position: relative. The ribbon should have a red background, white bold text, and rounded corners.","\u003Cstyle>\n  .product { position: relative; width: 240px; height: 140px; border: 1px solid #cbd5e1; padding: 16px; font-family: sans-serif; }\n  \u002F* Add .product::before here *\u002F\n\u003C\u002Fstyle>\n\u003Cdiv class='product'>Wireless Headphones\u003C\u002Fdiv>","A red SALE label appears in the top-right corner of the box.","2026-09-29T18:45:14+00:00",{"id":439,"slug":441,"title":440},{"id":447,"slug":449,"title":448}]