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- What is the accept attribute for HTML file input types
- TheacceptattributeinanHTMLfileinputspecifiesallowedfiletypesintheuploaddialog,improvinguserexperiencebyfilteringvisiblefiles.1.Itsupportsfileextensions(e.g.,.pdf,.jpg),MIMEtypes(e.g.,image/jpeg,application/pdf),andwildcards(e.g.,image/,audio/,video/)
- HTML Tutorial . Web Front-end 594 2025-08-02 16:39:01
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- What is the purpose of the HTML doctype
- ThepurposeoftheHTMLdeclarationistoensurethebrowserrendersthepageinstandardsmodebyspecifyingtheHTMLversion,preventingquirksmodethatcausesinconsistentlayoutbehavior;1.IttellsthebrowserwhichHTMLversionthedocumentuses;2.Ittriggersstandardsmodeforcorrectr
- HTML Tutorial . Web Front-end 770 2025-08-02 16:14:02
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- How to use the srcset attribute for responsive images in HTML
- By providing image files of different resolutions or sizes, the srcset attribute enables the browser to select the most appropriate image based on the device's screen size, pixel density and network conditions, thereby improving page loading speed and visual quality. 1. When using the width descriptor (w), images of different widths need to be listed in the srcset (such as 480w, 800w), and the display width of the image at different breakpoints should be defined with the sizes attribute, so that the browser can select the best image based on this; 2. When using the pixel density descriptor (x), corresponding images can be provided for standard screens (1x), Retina screens (2x), etc., suitable for scenes where only pixel density needs to be adapted; 3. Combining srcset and sizes can achieve fully responsive images, and self-responsive images can be achieved in different layouts.
- HTML Tutorial . Web Front-end 840 2025-08-02 16:09:02
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- What are block and inline elements in HTML
- Block-levelelementsstartonanewlineandtakefullwidth,whileinlineelementsflowwithintextandtakeonlyneededwidth;1.Blockelementsinclude,,–,,,,andrespectmargins,padding,anddimensions;2.Inlineelementsinclude,,,,,anddonotacceptwidth,height,oreffectivetop/bott
- HTML Tutorial . Web Front-end 437 2025-08-02 16:06:02
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- How to add captions and subtitles with the HTML track element
- Using HTML elements can add subtitles and subtitles to videos to improve accessibility and user experience; 2. It must be placed in a tag, reference the WebVTT format file through src, and set properties such as kind, srclang, label to define the type, language and display name; 3. The WebVTT file must start with "WEBVTT", define the text display period in the time code format (hh:mm:ss.mmm), use --> to separate the start and end times, and separate the different subtitle blocks with blank lines; 4. Recommended practices include: use captions for hearing-impaired users and include sound descriptions, provide multi-language support, set the default attribute to ensure that one track is enabled by default, test compatibility across browsers, and verify
- HTML Tutorial . Web Front-end 457 2025-08-02 15:40:12
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- HTML `srcdoc` Attribute for Iframes
- The srcdoc property is used in HTML tags, embedding HTML content directly instead of loading the page through external URLs. 1. It is often used to test HTML fragments, embed small independent documents, or avoid additional HTTP requests; 2. The difference from src is that src points to an external URL, while srcdoc directly contains HTML strings, and browsers preferentially use srcdoc; 3. When using it, you need to pay attention to content integrity, quotation mark escapes and complex pages. 4. It is compatible with mainstream browsers, but is not recommended for support scenarios of old browsers.
- HTML Tutorial . Web Front-end 693 2025-08-02 15:33:02
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- What is the HTML iframe tag and how to use it
- TheHTMLtagembedsexternalcontentintoawebpage;1.UsethesrcattributetospecifytheURLofthecontenttoembed;2.SetwidthandheightattributesoruseCSSforsizing;3.Alwaysincludeatitleforaccessibility;4.Applythesandboxattributetoenhancesecuritywhenembeddinguntrustedc
- HTML Tutorial . Web Front-end 520 2025-08-02 15:23:01
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- What is the novalidate attribute for an HTML form
- The novalidate attribute is used to disable the browser's default form verification; 1. After adding novalidate, the browser will not perform the default verification even if the input field contains constraints such as required, pattern, min, max, etc.; 2. The form will ignore whether the input is valid and submitted directly, which is suitable for custom verification using JavaScript, multi-step forms or temporary bypass verification in the development testing stage; 3. It is a Boolean property that does not require assignment, and acts on the entire form; 4. Remove novalidate to restore the normal verification behavior of the browser; therefore, novalidate enables developers to independently control the timing and method of form verification.
- HTML Tutorial . Web Front-end 494 2025-08-02 15:12:02
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- What are the best practices for writing clean and readable HTML code
- Use semantic HTML elements to improve accessibility, SEO, and code clarity, such as alternatives
- HTML Tutorial . Web Front-end 1013 2025-08-02 14:49:02
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- How to create an accessible skip link in an HTML page
- Placetheskiplinkasthefirstinteractiveelementinthebodywithhref="#main-content".2.HideitvisuallyusingCSSwithtop:-40pxandshowonfocusbysettingtop:6px.3.Ensurethetargetelement(e.g.,)hasid="main-content"andtabindex="-1"torecei
- HTML Tutorial . Web Front-end 942 2025-08-02 14:03:02
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- How to use the HTML map and area tags for image maps
- ImagemapsinHTMLallowmultipleclickableareasonasingleimageusingtheandtags.1.Usethetagwiththeusemapattribute,settingitsvalueto#mapnametolinktheimagetoamap.2.Definetheelementwithanameattributematchingtheusemapvalue(withoutthe#).3.Inside,addtagstocreatecl
- HTML Tutorial . Web Front-end 590 2025-08-02 13:59:01
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- How to use the data-* attributes in HTML for custom data
- The data-attribute is a feature in HTML5 used to store custom data on standard elements and does not affect the page layout; 1. Use the data-attribute to store private data on HTML elements, such as data-user-id; 2. Accessed through JavaScript's dataset attributes, such as element.dataset.userId; 3. You can also use getAttribute and setAttribute operations; 4. It can be used in CSS through attribute selector or attr() function; 5. It should avoid storing sensitive information, not abuse, or using style logic, and maintaining name semantics. These properties provide a flexible and semantic way of data delivery for scripts
- HTML Tutorial . Web Front-end 934 2025-08-02 13:44:02
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- How to use the HTML article tag for content
- Thetagisusedforself-contained,independentlydistributablecontentlikeblogposts,newsarticles,comments,orreviews;2.Itshouldbeusedwhencontentmakessenseonitsown,canbesyndicated(e.g.,inRSSfeeds),andhasitsownauthororpublicationdate;3.Nestingelementsisappropr
- HTML Tutorial . Web Front-end 685 2025-08-02 12:41:02
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- How to use the HTML picture element for art direction
- Theelementisusedforartdirectiontodeliverdifferentimagesbasedonscreensizeorlayout.1.Itcontainselementswithmediaqueriestospecifywheneachimageshouldbedisplayed,endingwitharequiredfallback.2.Commonusecasesincludemobilevs.desktopcropping,orientationchange
- HTML Tutorial . Web Front-end 715 2025-08-02 12:33:02
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