Article Tags
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How to add a background video in HTML5? (CSS Positioning)
The video is not fully covered, has black borders, and blocks text because the video is an inline replacement element by default. The parent container needs to be set to height, video, object-fit:cover and position:absolute top/left/right/bottom:0, and equipped with z-index:-1 or pointer-events:none; the background video must be added with autoplay, muted, loop, playsinline, and iOS requires H.264 MP4, overflow:hidden; fixed is suitable for full-screen fixation, absolute is suitable for scrolling containers; performance optimization requires will-
Feb 19, 2026 am 04:32 AM
How to use html5 templates for reusable content sections? (Web Components)
The tag is not rendered and requires JS cloning to be inserted into the DOM; its content is DocumentFragment, and cloneNode(true) is required for multiple uses; the script is not automatically executed, and the style needs to be manually injected into shadowDOM; IE does not support it, and a polyfill or downgrade solution is required.
Feb 19, 2026 am 04:27 AM
How to create a simple single-page application (SPA) using html5 and JavaScript? (Web Applications)
history.pushState can modify the URL without refreshing the page. It needs to cooperate with popstate monitoring to implement SPA navigation. When passing parameters, please note that the state object is not a string, the title is ignored, and the URL must have the same origin. It is necessary to intercept link clicks, use pathname to match routes uniformly, and configure server-side fallback.
Feb 19, 2026 am 03:14 AM
HTML5 Video: How to autoplay without sound? (Muted Attribute)
Autoplay must be set to muted at the same time to take effect, and Safari requires that the video element must be visible in the viewport; muted is a Boolean attribute and muted="false" cannot be written.
Feb 19, 2026 am 02:35 AM
How to draw and animate vector graphics with html5 SVG? (Graphics)
Prioritize using CSS animation (@keyframes transform). The animate tag is outdated, has poor compatibility, and is difficult to debug; SVG path "drawing" requires stroke-dasharray and stroke-dashoffset with getTotalLength(); displacement/scaling/rotation must use transform to avoid cx/cy or left/top; viewBox and width/height need to be configured together to prevent scaling distortion.
Feb 19, 2026 am 02:13 AM
How to build a basic e-commerce product page layout with html5? (Web Design)
Semantic tags should be used to improve the accessibility and SEO of e-commerce pages: the main body of the product must be in a single package, the image must have a descriptive alt attribute, the form must be verified with native attributes, and the price must be structured.
Feb 19, 2026 am 12:10 AM
How to manage focus and keyboard navigation in your html5 application? (Accessibility)
Tabindex should only use 0 or -1: 0 is used for custom controls that need to join the natural tab flow, and -1 is used for JS programmatic focus; role="button" needs to manually handle the Enter/Space key and preventDefault; focus management must ensure that the element is mounted and visible, and the target is explicitly focused after dynamic operation.
Feb 18, 2026 am 05:12 AM
How to use the html5 details and summary elements for creating accordions? (UI Elements)
Nesting is not supported because the specification limits it to the first child element and cannot contain interactive folding containers; multi-level menus need to be manually controlled using ARIA; the listening state must use the toggle event instead of change or click.
Feb 18, 2026 am 05:02 AM
How to lazy load images and videos in html5 for better performance? (Performance)
loading="lazy" is only valid for and native and is not supported; video lazy loading requires JS to manually control src or poster, combined with IntersectionObserver, and autoplay must initially contain muted and playsinline.
Feb 18, 2026 am 05:00 AM
How to enable offline access to your web application with html5 application cache? (Progressive Web Apps)
ApplicationCache has been completely abandoned, and modern browsers have completely removed support; the only and standard alternative is ServiceWorker CacheAPI, which requires HTTPS registration, manual management of cached versions, and explicit caching of key resources such as HTML.
Feb 18, 2026 am 04:58 AM
How to implement server-sent events for real-time updates with html5? (APIs)
EventSource is dedicated to server-side one-way real-time push. The server needs to return Content-Type: text/event-stream. Each message starts with data: and ends with \n\n. It supports automatic reconnection and Last-Event-ID push continuation, but does not support the client sending data.
Feb 18, 2026 am 04:44 AM
How to use the html5 progress element to show task completion? (UI Elements)
The progress element requires JavaScript to manually update the value before it can move. The ARIA attribute must be set synchronously to ensure barrier-free support. The units of max and value must be consistent, avoid decimals, and pay attention to browser style compatibility restrictions.
Feb 18, 2026 am 04:43 AM
How to use html5 data attributes to store custom data? (JavaScript)
The data-* attribute must start with data-, followed by letters, numbers, or hyphens. Underscores, spaces, and uppercase letters are prohibited; dataset reading and writing automatically converts to camel case but is irreversible. JSON needs to be serialized/parsed manually, and is only suitable for lightweight static configuration.
Feb 18, 2026 am 03:52 AM
How to create a simple drawing application with the html5 canvas? (Graphics)
The Canvas canvas does not save the drawing state, and the history needs to be managed manually; dragging and drawing lines requires monitoring mousedown/mousemove/mouseup events, beginPath() moveTo() when mousedown, lineTo() stroke() when mousemove; pay attention to coordinate conversion, preventDefault() anti-rolling, clearRect() full clear feature, and undo snapshot or instruction recording scheme.
Feb 18, 2026 am 03:34 AM
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