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In 2026, image optimization is a core web development skill due to its direct impact on \u003Cstrong>Core Web Vitals\u003C\u002Fstrong> and search rankings.\u003C\u002Fp>\u003Ch3 id=\"basic-image-syntax\">Basic Image Syntax\u003C\u002Fh3>\u003Cpre>\u003Ccode><img src=\"photo.jpg\" alt=\"A scenic mountain view at sunset\">\u003C\u002Fcode>\u003C\u002Fpre>\u003Cp>\u003Ccode><img>\u003C\u002Fcode> is a void element — it never has a closing tag.\u003C\u002Fp>\u003Ch3 id=\"the-alt-attribute-critical-for-seo-accessibility\">The alt Attribute: Critical for SEO & Accessibility\u003C\u002Fh3>\u003Cp>The \u003Ccode>alt\u003C\u002Fcode> attribute provides a text description of an image. It is essential for:\u003C\u002Fp>\u003Cul>\u003Cli>\u003Cstrong>Accessibility\u003C\u002Fstrong> — screen readers announce the alt text to visually impaired users.\u003C\u002Fli>\u003Cli>\u003Cstrong>SEO\u003C\u002Fstrong> — search engines use alt text to understand and index images (Google Images traffic).\u003C\u002Fli>\u003Cli>\u003Cstrong>Fallback\u003C\u002Fstrong> — if the image fails to load, the alt text displays instead.\u003C\u002Fli>\u003C\u002Ful>\u003Cpre>\u003Ccode><!-- Good: descriptive alt text -->\n<img src=\"golden-retriever.jpg\" alt=\"Golden retriever puppy playing in a park\">\n\n<!-- Bad: missing or vague alt text -->\n<img src=\"golden-retriever.jpg\" alt=\"image\">\u003C\u002Fcode>\u003C\u002Fpre>\u003Cp>For purely decorative images with no informational value, use an empty \u003Ccode>alt=\"\"\u003C\u002Fcode> so screen readers skip them.\u003C\u002Fp>\u003Ch3 id=\"controlling-image-size\">Controlling Image Size\u003C\u002Fh3>\u003Cpre>\u003Ccode><img src=\"logo.png\" alt=\"Company logo\" width=\"200\" height=\"100\">\u003C\u002Fcode>\u003C\u002Fpre>\u003Cp>Always specify \u003Ccode>width\u003C\u002Fcode> and \u003Ccode>height\u003C\u002Fcode> (or use CSS \u003Ccode>aspect-ratio\u003C\u002Fcode>) to prevent \u003Cstrong>Cumulative Layout Shift (CLS)\u003C\u002Fstrong>, a key Core Web Vitals metric.\u003C\u002Fp>\u003Ch3 id=\"native-lazy-loading-modern-performance-best-practice\">Native Lazy Loading (Modern Performance Best Practice)\u003C\u002Fh3>\u003Cp>The \u003Ccode>loading=\"lazy\"\u003C\u002Fcode> attribute tells the browser to defer loading off-screen images until the user scrolls near them — a major, trending performance optimization built directly into HTML5:\u003C\u002Fp>\u003Cpre>\u003Ccode><img src=\"large-photo.jpg\" alt=\"Product photo\" loading=\"lazy\">\u003C\u002Fcode>\u003C\u002Fpre>\u003Ch3 id=\"responsive-images-with-srcset\">Responsive Images with srcset\u003C\u002Fh3>\u003Cp>Modern responsive design uses the \u003Ccode>srcset\u003C\u002Fcode> attribute to serve different image resolutions depending on screen size and device pixel ratio:\u003C\u002Fp>\u003Cpre>\u003Ccode><img src=\"photo-800w.jpg\"\n     srcset=\"photo-400w.jpg 400w, photo-800w.jpg 800w, photo-1200w.jpg 1200w\"\n     sizes=\"(max-width: 600px) 400px, 800px\"\n     alt=\"Responsive product photo\">\u003C\u002Fcode>\u003C\u002Fpre>\u003Ch3 id=\"modern-image-formats-webp-avif\">Modern Image Formats: WebP & AVIF\u003C\u002Fh3>\u003Cp>Trending, next-generation formats like \u003Cstrong>WebP\u003C\u002Fstrong> and \u003Cstrong>AVIF\u003C\u002Fstrong> offer significantly smaller file sizes than JPEG\u002FPNG with comparable quality. 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