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Page Patterns
Sticky header Responsive navigation Accessible modal Accordion disclosure Tabs interface Toast notification Breadcrumbs Pagination controls
Forms & Interaction
Client-side validation Password visibility toggle Character counter Dependent select fields File preview Copy to clipboard Debounced search Progress indicator
Data & Network
Fetch JSON POST JSON Abort fetch request Handle HTTP errors Retry with backoff URL query parameters Local storage settings Session storage state
Performance & Quality
Lazy-load images Preload critical font Responsive images Skeleton loading Focus restoration Reduced motion support Error boundary UI Offline fallback
Web Development How-To / Forms & Interaction

File preview

Learn File preview in Web Development How-To with a focused explanation, a topic-specific example, and a mastery check.

12 min read • Beginner
web-how-to-013.html
html 
<input id="file" type="file" accept="image/*"><img id="preview" alt="Selected image preview" width="160"><script>file.onchange=()=>{const f=file.files[0];if(f)preview.src=URL.createObjectURL(f)}</script>
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Original Syntaxis Content · Original Syntaxis Content

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