`: The most important SEO factor. Keep it between 50-60 characters. Place your primary keyword near the beginning.\n- `<meta name=\"description\">`: A summary of the page (150-160 characters). Google often uses this as the snippet below the title in search results. It doesn't directly impact ranking, but heavily influences Click-Through Rate (CTR).","## The Viewport Meta Tag","Without this tag, mobile browsers will assume your page is designed for desktop (around 980px wide) and zoom out, making the text tiny and unreadable.\n\n`<meta name=\"viewport\" content=\"width=device-width, initial-scale=1.0\">` tells the browser to match the screen's width and set the initial zoom to 100%.","## Open Graph & Twitter Cards","When you share a link on iMessage, Slack, Twitter, or Facebook, a beautiful card with an image, title, and description appears. This is achieved using Open Graph (`og:`) and Twitter (`twitter:`) meta tags.","## Canonical Links and Favicons","Using the `<link>` tag:\n- **Favicon:** The small icon in the browser tab. `<link rel=\"icon\" href=\"favicon.ico\">`\n- **Canonical URL:** If you have duplicate content on different URLs (e.g., `example.com/shoes` and `example.com/shoes?sort=price`), the canonical link tells Google which URL is the \"master\" version to index, preventing duplicate content penalties."],"codeSnippet":"","codeSnippets":[{"title":"The Ultimate SEO & Social Sharing <head>","code":"$39","language":"html","_id":"6a796b1f09e092577f7761a4"}],"language":"javascript","tryItChallenge":"Create a `<head>` section for a fictional startup. 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Add a \"Lunch Break\" that uses `colspan=\"5\"` to stretch across the whole week at 12 PM.","order":5,"learningActivities":{"build":{"description":"","enabled":false,"estimatedMinutes":0,"requirements":[],"title":""},"practiceQuestions":[],"revisionQuestions":[]},"learningAvailability":{"reviseCount":4,"practiceCount":4,"build":false}},{"_id":"6a796ad309e092577f776180","slug":"chapter-7-html-forms-collecting-user-input-part-1","title":"Chapter 7: HTML Forms — Collecting User Input (Part 1)","tryItChallenge":"Create a 'Contact Us' form. Use a GET method. Include a text input for the user's name, an email input, and a group of three radio buttons asking how they found your site. Wrap it all in a `<form>` and add a submit button. 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Add a `<noscript>` tag in the body that displays a friendly message to users without JS.","order":10,"learningActivities":{"build":{"description":"","enabled":false,"estimatedMinutes":0,"requirements":[],"title":""},"practiceQuestions":[],"revisionQuestions":[]},"learningAvailability":{"reviseCount":11,"practiceCount":11,"build":false}},{"_id":"6a796b1f09e092577f7761b3","slug":"chapter-12-html-attributes-masterclass-global-attributes-data-attributes","title":"Chapter 12: HTML Attributes Masterclass — Global Attributes & Data Attributes","tryItChallenge":"Create a list of three `<article>` elements. Add a custom `data-author` attribute to each article with a different name. Add `contenteditable=\"true\"` to one of the articles so you can edit the text.","order":11,"learningActivities":{"build":{"description":"","enabled":false,"estimatedMinutes":0,"requirements":[],"title":""},"practiceQuestions":[],"revisionQuestions":[]},"learningAvailability":{"reviseCount":10,"practiceCount":10,"build":false}}],"prevChapter":{"_id":"6a796b1f09e092577f77619b","slug":"chapter-9-semantic-html5-writing-meaningful-markup","title":"Chapter 9: Semantic HTML5 — Writing Meaningful Markup","tryItChallenge":"Take a traditional layout built with `<div>` tags (`<div class=\"header\">`, `<div class=\"sidebar\">`, `<div class=\"content\">`) and rewrite it using modern HTML5 semantic tags.","order":8,"learningActivities":{"build":{"description":"","enabled":false,"estimatedMinutes":0,"requirements":[],"title":""},"practiceQuestions":[],"revisionQuestions":[]}},"nextChapter":{"_id":"6a796b1f09e092577f7761aa","slug":"chapter-11-embedded-content-svgs-canvas-and-scripts","title":"Chapter 11: Embedded Content, SVGs, Canvas, and Scripts","tryItChallenge":"Create an HTML file. 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It doesn't directly impact ranking, but heavily influences Click-Through Rate (CTR).","## The Viewport Meta Tag","Without this tag, mobile browsers will assume your page is designed for desktop (around 980px wide) and zoom out, making the text tiny and unreadable.\n\n`<meta name=\"viewport\" content=\"width=device-width, initial-scale=1.0\">` tells the browser to match the screen's width and set the initial zoom to 100%.","## Open Graph & Twitter Cards","When you share a link on iMessage, Slack, Twitter, or Facebook, a beautiful card with an image, title, and description appears. 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