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What is the difference between and ?
isthemodern,preferredmethodinHTML5fordeclaringcharacterencoding,offeringashort,efficientsyntaxthatbrowsersparseearlytopreventrenderingissues.2.istheolder,legacyapproachusedinHTML4andXHTMLtosimulateanHTTPheader,achievingthesameencodingresultbutwithmor
Aug 06, 2025 am 10:48 AM
How do you fullscreen an HTML5 video?
To fully screen HTML5 video, you can use the browser's full-screen API; 2. Call the video.requestFullscreen() method through JavaScript to achieve full screen, which needs to be triggered when user interaction (such as clicks); 3. To be compatible with old browsers, you should check the requestFullscreen, mozRequestFullScreen, webkitRequestFullscreen, and msRequestFullscreen; 4. ExitFullscreen() to call document.exitFullscreen() and process its browser prefix version; 5. Note that full-screen requests must be triggered by user operations; 5.
Aug 06, 2025 am 10:21 AM
How do you disable an element in HTML5?
To disable HTML5 elements, use the disabled attribute, which is suitable for form elements such as, , and; 1. Add disabled attributes to disable elements without assignment; 2. Disable elements will render a gray appearance by default, and you can customize the style through: disabled pseudo-class; 3. Disabled form elements will not be submitted with the form; 4. The disabled attribute value can be dynamically set to switch states through JavaScript; 5. Non-form elements do not support disabled attributes, and they need to combine CSS's pointer-events:none and JavaScript to simulate the disable effect.
Aug 06, 2025 am 09:53 AM
What is the canPlayType() method used for in HTML5 media elements?
The canPlayType() method is used to detect whether the browser supports a specific audio and video format. Developers can select appropriate media sources for compatibility optimization based on this. The return value is "probably", "maybe" or empty string, indicating that it is likely to be supported, possible to be supported and not supported respectively. 1. When calling, string parameters containing MIME type and optional codecs must be passed in; 2. It is often used to traverse multiple formats to select the first source that may or may be supported; 3. In actual applications, client detection and server optimization must be combined, and the file cannot be guaranteed to be played, because of network or file problems, it may still cause playback failure.
Aug 06, 2025 am 08:30 AM
How do you use the pattern attribute for input validation in HTML5?
ThepatternattributeinHTML5isusedtospecifyaregularexpressionthattheinputvaluemustmatchtobevalid,anditworkswithinputtypesliketext,tel,email,url,andpassword;1.ItenforcescustomtextformattingdirectlyinthebrowserwithoutJavaScriptbyvalidatingtheentireinputv
Aug 06, 2025 am 07:58 AM
How do you create a nested list in HTML5?
To create an HTML5 nested list, one list needs to be placed into the elements of another list. 1. It can be used or used as an outer and inner list, supporting mixed types; 2. The inner list must be nested directly inside the tag and cannot be placed outside; 3. All tags must be closed correctly to keep the structure valid; 4. The browser will automatically indent the nested list, and can also customize the style through CSS.
Aug 06, 2025 am 07:05 AM
What is local storage in HTML5?
LocalstorageinHTML5allowswebappstostoredatapermanentlyinauser'sbrowserwithoutimpactingperformance.1)Itprovidespersistentstoragethatremainsuntilmanuallyremoved.2)Itofferslargecapacity(5–10MBperdomain),farexceedingcookies.3)Itoperatesclient-sideonly,re
Aug 06, 2025 am 04:39 AM
How does the element function in HTML5?
HTMLelementsaredefinedbystartandendtags,withcontentinbetween,andsomeelementsareself-closing;2.Semanticelementslike,,,,andprovidemeaningfulstructureforaccessibilityandSEO;3.Elementsuseattributessuchashrefandsrctospecifybehaviororresources,enhancingfun
Aug 06, 2025 am 03:50 AM
How to draw on top of an HTML5 video?
Yes, drawing on video can be achieved by superimposing elements on HTML5 video. The specific steps are as follows: 1. Use relatively positioned containers to wrap and elements in HTML to make the canvas absolutely positioned over the video; 2. Use JavaScript to obtain the canvas context, and draw the graphics when the user clicks or the video plays to a specific time, such as drawing a translucent red circle at the click position; 3. You can clear the canvas through the clearCanvas function, or dynamically display and clear the annotations according to the video playback time in the timeupdate event; 4. If the video size changes, JavaScript needs to be used to synchronize the canvas size and redraw content to ensure that the drawing is aligned with the video.
Aug 06, 2025 am 01:33 AM
What is the doctype in HTML5?
It is a necessary tag used in HTML5 to declare document types and must be located at the beginning of the document; its function is to ensure that the browser renders the page in standard mode to avoid compatibility issues caused by the lack of declarations; the declaration is concise, case-insensitive and does not require reference to DTD; correct use can ensure the expected behavior of HTML, CSS and JavaScript.
Aug 06, 2025 am 01:15 AM
How do you loop an audio or video file in HTML5?
To make the audio or video file loop in HTML5, just add the loop attribute in the audio or video tag. 1. For basic loops, add loop attributes directly to the audio or video element, for example, or will automatically start from scratch after playback. 2. If you need to play and loop automatically, you can combine the autoplay, loop and muted properties, especially suitable for background videos, such as. 3. The loop state can be controlled through JavaScript, and set video.loop=true to enable or video.loop=false to disable. 4. If you need to accurately loop a specific time period, you need to use JavaScript to listen to the time and manually set cur
Aug 06, 2025 am 12:13 AM
How can you store data offline using HTML5?
Use localStorage to store key-value pairs without expiration time, suitable for persistent user preferences, limited to 5-10MB per domain name; 2. Use sessionStorage to store session-level data, close the tab page and clear it, suitable for temporary form data; 3. Use IndexedDB to store a large amount of structured data, support transactions and asynchronous operations, suitable for offline priority applications; 4. Use CacheAPI to cache network resources with ServiceWorker to achieve offline access to static resources, suitable for PWA; 5. WebSQL has been deprecated and is not recommended for new projects; use CacheAPI comprehensively to cache static resources, IndexedDB or localS
Aug 05, 2025 pm 08:34 PM
What is the purpose of the DOCTYPE declaration in HTML5?
Tell the browser that the document should be processed as HTML5, 1. Trigger the standard mode to ensure that the browser uses modern standardized rules to render the page; 2. Short and easy to use, without reference to DTD; 3. Although simple but necessary, it avoids rendering problems caused by the browser entering weird mode; it is a necessary statement for the correct rendering of HTML5 documents.
Aug 05, 2025 pm 08:32 PM
How do you use the srcdoc attribute for elements?
Use the srcdoc attribute to embed HTML content directly in the iframe without external requests; 2. Pay attention to quote escape, it is recommended to use single quotes or HTML entities to avoid conflicts; 3. Inline CSS and JavaScript can be included in srcdoc, but script execution may be restricted by browser security policies; 4. For security reasons, it should be used in combination with the sandbox attribute, such as allow-scripts to enable script running; 5. For old browsers that do not support srcdoc, the content can be loaded through the src attribute; srcdoc has a higher priority than src in supported browsers, and is suitable for embedding small, dynamic or generated HTML fragments, and it is recommended to handle it properly.
Aug 05, 2025 pm 08:31 PM
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