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- What is the bdi (Bi-Directional Isolation) element?
- BDI elements are used to isolate and independently deal with bidirectional text orientation issues in mixed language text. It ensures that nested content is displayed in its own direction and is not affected by external text. It is often used to display user-generated content, tabular data, and multilingual chat interfaces. Unlike the dir attribute, it has automatic direction identification and isolation functions, which can effectively avoid typography confusion.
- HTML Tutorial . Web Front-end 784 2025-07-14 02:17:42
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- How to prevent form resubmission on page refresh in HTML?
- Refreshing after submitting a form may lead to repeated submissions, which can be avoided in three ways: 1. Using PRG mode, the server returns a redirect response after processing the POST request, causing the user to jump to a new page to prevent repeated submissions; 2. The front-end uses JavaScript to disable the submission button after the first submission or prevent repeated triggers, which is suitable for simple scenarios; 3. Using SessionToken, embed a one-time token in the form, verify and invalidate it during submission, which is suitable for high concurrency or sensitive operations.
- HTML Tutorial . Web Front-end 612 2025-07-14 02:12:22
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- How to automatically focus an input field on page load using the autofocus attribute?
- The autofocus input box when the page is loaded can be implemented through the HTML autofocus property. This property is a Boolean value, applicable to, or an element, and when the page is added to it, it will automatically focus on the element when the page is loaded. Note when using: 1. Only one element in the page can be set to autofocus, otherwise only the first one will take effect; 2. Most modern browsers support it, but mobile devices such as iOS may restrict autofocus; 3. If autofocus does not take effect, you can check the location of the element, browser plug-in, or use JavaScript to force focus. It is recommended to prioritize the use of native attributes to improve efficiency and user experience.
- HTML Tutorial . Web Front-end 1005 2025-07-14 02:12:02
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- What are meta tags in HTML and what are they for?
- Meta tags are text snippets in HTML that describe the content of web pages. They are not displayed on the page, but are used by browsers and search engines to correctly display and understand the website. They are located in the HTML document, and common types include: 1. Charsetmeta tags (set character encoding); 2. Viewportmeta tags (influence mobile device responsive design); 3. Descriptionmeta tags (influence page summary in search engine results); 4. OpenGraph/TwitterCards (control web page sharing display on social media). Meta tags have an auxiliary effect on SEO, such as improving click-through rate and improving mobile display, but some tags are like k
- HTML Tutorial . Web Front-end 609 2025-07-14 02:11:21
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- What is the difference between aria-label, aria-labelledby, and aria-describedby?
- The ARIA attributes aria-label, aria-labeledby and aria-describedby have different uses and need to be selected according to the scene. 1. Use aria-label to provide direct accessible names for elements with no visible labels. For example, the button "?" can be recognized by the screen reading software as a "close button". 2. Use aria-labelledby to refer to existing visible tags on the page. It is suitable for elements with existing visual tags. For example, the form input box can be associated with its corresponding tags through aria-labelledby. 3. Use aria-describedby as the element
- HTML Tutorial . Web Front-end 770 2025-07-14 02:11:01
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- What is the HTML declaration for?
- TheDOCTYPEdeclarationisnecessarytoensureconsistentrenderingacrossbrowsersbyspecifyingtheHTMLversionused.1.Ithelpsbrowsersswitchbetweenstandardsmodeandquirksmode,ensuringcorrectlayoutbehavior.2.ModernwebsitesshouldusetoindicateHTML5,whichissimpleandwi
- HTML Tutorial . Web Front-end 911 2025-07-14 02:10:22
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- How to add a comment in HTML code?
- The only correct way to add comments in HTML is to use syntax. 1. The comment content will not be displayed on the web page, but can be used to explain the code structure or temporarily block the code; 2. The basic format is, and it supports cross-line writing; 3. It is suitable for all HTML versions, and is often used to explain complex structures, hidden code during debugging, team collaboration and communication, etc.; 4. It is not recommended to overuse to avoid affecting the readability of the code; 5. The comment syntax of CSS or JavaScript cannot be used, otherwise it will be displayed as text by the browser.
- HTML Tutorial . Web Front-end 680 2025-07-14 02:01:52
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- How to embed Scalable Vector Graphics (SVG) directly in html?
- In web page development, SVG can be embedded into HTML pages directly by inlining SVG tags, exporting graphic tool codes, etc. 1. Write code directly using tags to achieve full inline, easy control and interaction, but may increase HTML volume; 2. Export SVG from graphics tools and clean up redundant code and embed it, allowing resources to be reused quickly; 3. Pay attention to namespace declarations, style compatibility and property updates to ensure that the normal display and function are consistent across browsers.
- HTML Tutorial . Web Front-end 972 2025-07-14 01:50:11
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- How to create a simple image gallery in HTML?
- To create a simple image gallery on a web page, use HTML and CSS to do so. 1. Use div to wrap multiple img tags to build the basic structure; 2. Use flex or grid layout to display pictures side by side, and set gap control spacing; 3. Add hover effects to improve the interactive experience, such as border changes and image enlargement; 4. Optional responsive design to adapt to different screen sizes.
- HTML Tutorial . Web Front-end 797 2025-07-14 01:25:21
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- How to embed a YouTube video in HTML?
- To embed YouTube videos in web pages, just copy and paste the code provided by YouTube. First, open the target video, click the "Share" button, select "Embed" and copy the HTML code that appears, including the key src address and optional parameters such as allowfullscreen, autoplay, etc. Then paste the code in the appropriate location in the HTML file. If you use Jekyll or WordPress, you can also insert it into the custom HTML module. Finally, adjust the size, set a responsive design or add automatic playback parameters as needed?autoplay=1, note that the browser may restrict automatic playback with sound. Simple operation but attention should be paid to details to ensure complete functions and user body
- HTML Tutorial . Web Front-end 937 2025-07-14 00:48:12
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- What is the difference between a block-level link and an inline link?
- Block-level links and inline links behave differently in HTML and CSS because they belong to different display types. 1. Block-level links are defined by display:block, occupying the entire line and setting width and height, which is suitable for large click areas such as navigation menus and buttons; 2. Inline links are the default state, occupying only the space required for content, and are suitable for text links in paragraphs; 3. The display type affects the layout method and click area. Block-level links are suitable for scenes that require complete control of size and spacing, while inline links are more suitable for embedding into text streams without destroying the layout structure. Choosing which link type to use should be based on design goals and user experience requirements.
- HTML Tutorial . Web Front-end 853 2025-07-14 00:23:21
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- How to create a responsive grid layout with HTML and CSS?
- To implement responsive grid layout, the core lies in using CSSGrid and media queries. 1. Use display:grid and repeat (auto-fit,minmax(200px,1fr)) to define the adaptive structure; 2. Set the spacing through gap; 3. Optionally use media query to fix the number of columns at specific breakpoints; 4. Pay attention to the image setting to width:100%, using box-sizing:border-box, and browser compatibility issues.
- HTML Tutorial . Web Front-end 266 2025-07-14 00:20:02
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- What is the required attribute in HTML forms?
- TherequiredattributeinHTMLmakesformfieldsmandatory,ensuringusersprovideessentialinformationbeforesubmittingaform.Touseit,simplyaddthekeywordrequiredtoinputtagsliketext,email,orpassword,forexample:.Italsoworkswithandelementsbutnotwithhiddeninputsorbut
- HTML Tutorial . Web Front-end 875 2025-07-14 00:16:41
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- What is the significance of the DOCTYPE declaration in html?
- TheDOCTYPEdeclarationisessentialinHTMLasitensuresstandardsmoderendering,aidsvalidationandtooling,andsupportslegacybrowsers.First,ittellsthebrowsertousemodernwebstandardsbyincluding,preventingquirksmodewhichcauseslayoutandstyleinconsistencies.Second,i
- HTML Tutorial . Web Front-end 132 2025-07-14 00:14:21
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