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``` ### ARIA Properties & States ```html aria-label="Close dialog" aria-labelledby="heading-id" aria-describedby="hint-id error-id" aria-expanded="false" aria-checked="true" aria-selected="true" aria-disabled="true" aria-invalid="true" aria-pressed="false" aria-busy="true" aria-hidden="true" aria-live="polite" aria-live="assertive" aria-atomic="true" aria-controls="panel-id" aria-owns="child-id" aria-haspopup="listbox" aria-current="page" aria-setsize="10" aria-posinset="3" ``` ### Keyboard Accessibility ```html
Focusable div
Focusable by JS only
...
``` --- ## 4. `` — Meta Tags & SEO ```html Page Title (50–60 chars) — Site Name ``` --- ## 5. Images & Media ```html Descriptive alt text — what does the image show and why is it here Hero image ``` --- ## 6. Interactive Elements ```html

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70% 6 GB ``` --- ## 7. Structured Data (JSON-LD) ```html ``` --- ## 8. Web Components ```html Click me

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Card body content.

 ``` --- ## 9. SVG in HTML ```html Company Logo ``` --- ## 10. Performance HTML Patterns ```html ``` --- ## Core Competency Summary - Write semantic, accessible HTML5 that communicates meaning to browsers and screen readers - Build inclusive forms with proper labels, ARIA, validation, and autocomplete - Optimize `` with SEO meta tags, Open Graph, favicons, and resource hints - Mark up responsive images with `srcset`, `sizes`, and `` for performance - Use native interactive elements: ``, `
`, Popover API - Add structured data with JSON-LD for rich search results - Build reusable Web Components with Shadow DOM and slots - Apply WCAG 2.1 AA accessibility standards throughout all markup