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- HTML `details` Element Toggle State with JavaScript
- To control the expansion or collapse state of HTML elements, the key is to manipulate its open attribute. 1. It is a native HTML element used to create a foldable content block. It is closed by default. Add the open attribute to expand by default. 2. Get the elements through JavaScript and set details.open=true to expand, details.open=false to close, and use details.open=!details.open to switch states; 3. Common practice is to bind button click events to switch states; 4. Be careful not to judge the state with class or style, nor can you set open in inline styles; 5. It has good compatibility in modern browsers, but old browsers may
- HTML Tutorial . Web Front-end 810 2025-08-01 04:39:42
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- HTML Linting Tools for Code Quality
- HTMLLinting is necessary because it can detect problems such as irregular label nesting, spelling errors, unclosed labels in advance, and unify the code style; common tools include HTMLHint, Tidy, eslint-plugin-html, and Stylelint plug-ins; the integration methods include editor real-time prompts, construction process checks, and automatic fixing of some problems; configuration suggestions include attribute quotation marks, lowercase tags, closed tags, and control nesting levels, but the rules should not be too many to avoid affecting the development experience.
- HTML Tutorial . Web Front-end 315 2025-08-01 04:30:41
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- How to create a description list for terms and definitions in HTML
- To create a description list of terms and definitions, use, and elements; 1. Use as a list container to mark the terms and provide definitions; 2. Use multiple for a definition, or provide multiple for a term to express different meanings; 3. Use CSS to enhance readability, such as bold terminology, adjust indentation; 4. Avoid using description lists for layout, ensure correct semantics to improve accessibility and SEO effects, and ultimately achieve clear and standard-compliant structured content.
- HTML Tutorial . Web Front-end 301 2025-08-01 04:29:12
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- How to create a submit button?
- Useorinsideatocreateasubmitbutton.2.StylethebuttonwithCSSclassesforbetterappearance,includingcolors,padding,andhovereffects.3.AddJavaScripttovalidateformdatabeforesubmissionbylisteningtotheform’ssubmiteventandusingevent.preventDefault()ifneeded.4.Ino
- HTML Tutorial . Web Front-end 787 2025-08-01 03:47:11
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- What is the purpose of the doctype in an HTML file
- Thepurposeofthedeclarationistoensurethebrowserrendersthepageinstandardsmode.1.IttellsthebrowserwhichHTMLversionthedocumentuses,withindicatingHTML5.2.Withoutit,browsersmayenterquirksmode,leadingtoinconsistentrendering.3.Itensuresstandardsmode,wherebro
- HTML Tutorial . Web Front-end 356 2025-08-01 03:46:02
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- What is the purpose of the HTML class attribute
- ThepurposeoftheHTMLclassattributeistoassignoneormoreclassnamestoanelementforstylingwithCSSormanipulationwithJavaScript;1.ItenablesconsistentstylingacrossmultipleelementsusingCSSruleslike.highlight{background-color:yellow;};2.ItallowsJavaScripttoselec
- HTML Tutorial . Web Front-end 696 2025-08-01 03:26:21
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- How to properly nest header tags (h1 through h6) in HTML
- Correctly nesting HTML title tags requires logical hierarchy rather than physical nesting. The specific steps are: 1. Only one is used per page as the main title; 2. Use the title level in sequence to avoid skipping or reverse order; 3. The title semantics should reflect the importance of the content rather than visual style, and use CSS to control the appearance; 4. Combining and other semantic tags to strengthen the structure, making the content hierarchy clear, and improving accessibility, SEO and screen reader navigation experience.
- HTML Tutorial . Web Front-end 415 2025-08-01 02:30:01
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- How to make an iframe responsive in HTML
- Wraptheiframeinacontainerdiv.2.UseCSSwitheitherthepadding-bottomtechnique(e.g.,padding-bottom:56.25%for16:9)orthemodernaspect-ratioproperty(e.g.,aspect-ratio:16/9)onthecontainer.3.Positiontheiframeabsolutely(forpaddingmethod)orletitfillthecontainerna
- HTML Tutorial . Web Front-end 696 2025-08-01 01:27:31
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- How to create a page header with the element in HTML
- When creating a page header with elements, it should be used as a semantic label to wrap the introduction content of the web page or area. 1. Usually, one is placed at the top of the page, including the website title, navigation menu, etc.; 2. It can include the title and navigation elements; 3. Avoid only for style layout, and should be visually beautified in combination with CSS; 4. Pay attention to avoiding multiple tags and neglecting accessibility issues. Correct use can improve SEO and user experience, and ultimately achieve a clear and easy-to-maintain web header.
- HTML Tutorial . Web Front-end 374 2025-08-01 00:51:22
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- How to create a responsive HTML video embed
- Use package container and embedded aspect ratio technology to realize the responsive layout of videos in HTML. 1. For iframe embeddings such as YouTube and Vimeo, you need to create a relatively positioned package div, set width:100%, height:0 and padding-bottom:56.25% (16:9 ratio), and absolutely position the iframe to fill the container; 2. For self-hosted elements, just set the package container to width:100% and apply overflow:hidden, and set width:100%, height:auto and display:block to maintain the proportion and eliminate gaps; 3.
- HTML Tutorial . Web Front-end 878 2025-08-01 00:14:12
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- HTML Internationalization and Localization
- Internationalization and localization require setting language attributes, using UTF-8 encoding, dynamically formatting content, and managing multilingual resources. 1. Set lang and xml:lang attributes to identify the page language; 2. Use UTF-8 encoding to avoid garbled code and ensure the server configuration is correct; 3. Use Intl objects or framework plug-ins to process related formats such as dates, currency, etc.; 4. Store multi-language content through JSON files, load and provide switching functions according to user preferences.
- HTML Tutorial . Web Front-end 502 2025-07-31 12:08:40
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- How to use the HTML dir attribute for text direction
- TheHTMLdirattributespecifiestextdirectionforproperrenderingofRTLlanguageslikeArabicorHebrew.1.Usedir="rtl"onthetagtosettheentiredocument’sdirection.2.Applydir="ltr",dir="rtl",ordir="auto"tospecificelementssucha
- HTML Tutorial . Web Front-end 168 2025-07-31 12:06:30
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- How to use the details and summary tags for an HTML accordion
- Use and tags to create accessible drop-down accordion effects without JavaScript; 2. Default content collapses, add open attributes to expand by default; 3. Custom styles can be customized through CSS, such as borders, backgrounds and custom arrows; 4. Multiple elements can be combined into a multi-panel accordion, which supports multiple openings by default, and JavaScript control is required; 5. Natively support screen readers and keyboard navigation, with strong semantics, and can achieve barrier-free access without ARIA. It is a lightweight, reliable and easy-to-implement solution.
- HTML Tutorial . Web Front-end 601 2025-07-31 12:04:51
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- Optimizing HTML for Web Vitals
- Improve the core performance indicators of web pages (WebVitals) should start with optimizing the HTML structure, which includes the following points: 1. Reduce unnecessary DOM nodes, avoid excessive nesting, clean up discarded code, and use lightweight tags to shorten the parsing and rendering time; 2. Optimize the key rendering path, use key CSS inline, delay loading non-first-screen resources, and reasonably use async and defer to load scripts to speed up the first rendering; 3. Improve the interaction response speed, load key scripts as soon as possible, avoid a large number of inline scripts, and add loading="eager" to interactive elements; 4. Reasonably set meta tags and semantic structures, and use correct HTML tags and viewport settings.
- HTML Tutorial . Web Front-end 339 2025-07-31 12:02:50
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