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- Conditional Comments in HTML for IE
- ConditionalComments is a special comment syntax designed for Internet Explorer in HTML, allowing developers to load specific resources for different versions of IE. 1. It only takes effect in the specified IE version, such as
- HTML Tutorial . Web Front-end 847 2025-08-02 16:50:02
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- How to create an ordered list that continues numbering from a previous list in HTML
- To make the HTML ordered list follow the number of the previous list, the start attribute is required; 1. Set the start attribute in the subsequent tag, and the value is plus 1 to the last item of the previous list. For example, the previous list ends at 3, the new list uses start="4"; 2. Note that start only controls the display number and needs to manually calculate the starting value; 3. For dynamic or complex layouts, it is recommended to use CSS counters to achieve automatic continuous numbering to improve maintainability and accessibility; 4. Ensure that the list belongs to the same sequence semantically and performs screen reader testing when there are accessibility requirements. This method is simple and effective and is suitable for static content.
- HTML Tutorial . Web Front-end 956 2025-08-02 16:48:03
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- How to create a submit button that sends form data in HTML
- Use elements and set the action and method attributes to specify the data submission address and method; 2. Add input fields with name attribute to ensure that the data can be recognized by the server; 3. Use or create a submission button, and after clicking, the browser will send the form data to the specified URL, which will be processed by the backend to complete the data submission.
- HTML Tutorial . Web Front-end 544 2025-08-02 16:46:01
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- Using HTML `textarea` `rows` and `cols`
- The rows and cols properties of textarea control the number of lines in the text area and the number of characters per line respectively. rows specifies the number of lines displayed, and cols specifies the width of characters displayed per line. Both are based on character units, non-pixels or percentages. If the CSS width and height are set at the same time during use, CSS will override the rows and cols effects, especially when the mobile terminal may show differences due to screen size and zooming. It is recommended to use CSS to set width and height or use em units when the display requirements are high, and test the performance under different devices.
- HTML Tutorial . Web Front-end 182 2025-08-02 16:45:02
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- How to create a search input field in an HTML form
- Usetheelementwithinatagtocreateasemanticsearchfield.2.Includeaforaccessibility,settheform'sactionandmethod="get"attributestosenddatatoasearchendpointwithashareableURL.3.Addname="q"todefinethequeryparameter,useplaceholdertoguideuse
- HTML Tutorial . Web Front-end 230 2025-08-02 16:44:02
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- How to use colgroup and col to style HTML table columns
- Use colgroup and col to efficiently apply styles to the entire column of HTML tables. 1. Define column groups through colgroups, col specifies each column style, and place it in the header of the table; 2. Use span attributes to allow a single col to affect multiple columns; 3. It is recommended to use CSS classes instead of inline styles to improve maintainability; 4. Only some styles (such as width, background, alignment) take effect, padding or font size needs to be set through td/th; 5. Colgroup must be before tr, head, and tbody; 6. Multiple colgroups can be used to implement style control of different column areas; it is suitable for large or dynamic tables that require unified column width, background or border, to keep the style consistent and
- HTML Tutorial . Web Front-end 862 2025-08-02 16:43:01
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- How to properly nest HTML elements
- The key to correctly nesting HTML elements is to follow parent-child hierarchy relationships, content model rules, and semantic structures. 1. Always close the tags in the opposite order (open and close first); 2. Avoid nesting block-level elements (such as) within the line elements (such as); 3. Avoid over-necking and nesting only when layout, semantics or styles are needed; 4. Use HTML5 semantic elements (such as, ,) to build logical structures; 5. Check for errors through the W3C validator and correctly indent the code to improve readability. Following these rules ensures that web pages have good accessibility, SEO and maintainability.
- HTML Tutorial . Web Front-end 753 2025-08-02 16:41:01
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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 519 2025-08-02 15:23:01
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