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  • How to create a read-only input field in HTML?
    How to create a read-only input field in HTML?
    The way to create a read-only input box in HTML is to use the readonly property, which allows the value to be submitted and the copy content can be optionally copied. The specific operation is to directly add readonly attributes to the tag, such as:; it can also be dynamically controlled through JavaScript, such as document.getElementById("myInput").readOnly=true; Different from disabled, the readonly input box data can be submitted, the style is consistent with the normal input box and supports focus, while disabled does not submit data, the style is gray by default and cannot be focused; it can also be combined with CSS to improve the experience, such as setting background color and border for distinction.
    HTML Tutorial . Web Front-end 589 2025-07-16 04:50:21
  • What is event bubbling in the HTML DOM?
    What is event bubbling in the HTML DOM?
    Eventbubblingistheprocesswhereaneventpropagatesupwardthroughnestedelements,startingfromthetargetelementtoitsancestors.Forexample,clickingabuttoninsidenesteddivstriggerstheclickeventonthebuttonfirst,thenoneachparentinturn.Thisbehaviorimpactseventhandl
    HTML Tutorial . Web Front-end 890 2025-07-16 04:49:42
  • What is the loading='lazy' attribute for images?
    What is the loading='lazy' attribute for images?
    The reason for using loading="lazy" is that off-screen images can be loaded latently, thereby improving page performance. Specific benefits include: 1. Speed up the initial page loading speed; 2. Save user bandwidth, especially for mobile devices; 3. Reduce server requests. Applicable scenarios are: 1. Pictures below the home screen; 2. Gallery or list with more pictures; 3. Avatar or thumbnails in the long list. Not applicable are: 1. Pictures that are immediately visible at the top of the page; 2. Small icons or key content pictures. The method of using is to directly add the loading="lazy" attribute to the tag, and supports srcset and srcset. Notes are: 1. Older browsers will ignore this property; 2. Confirm
    HTML Tutorial . Web Front-end 409 2025-07-16 04:49:21
  • What is the sandbox attribute for an iframe?
    What is the sandbox attribute for an iframe?
    The sandbox attribute improves security by limiting the ability of iframe content. It disables scripts, form submission and other operations by default. You can selectively enable specific functions using allow-scripts, allow-forms and other flags; 1. It is often used to embed third-party or untrusted content to prevent malicious behavior; 2. When using it, be careful not to rely solely on sandbox, but should combine other security policies such as CSP; 3. The allow-same-origin flag may bring security risks; 4. There may be differences in support for sandbox by different browsers.
    HTML Tutorial . Web Front-end 543 2025-07-16 04:48:41
  • What is the title attribute in HTML and where can it be used?
    What is the title attribute in HTML and where can it be used?
    The title attribute can be applied to almost all HTML tags, such as,,,,,, etc., and is used to display prompt information when hovering. Common uses include explaining the purpose of the link, supplementing the picture description, prompting the input format, explaining the button function, or layout block function. When using it, you should pay attention to: 1. It should not be relied on to transmit key information, because the mobile terminal does not support hover and the screen reader compatibility is poor; 2. The content should be short to avoid lengthy affecting the experience; 3. Avoid duplication with existing text; 4. The style is limited and the appearance cannot be customized. Compared with other prompt methods, the alt attribute pays more attention to accessibility, aria-label or aria-describedby is more suitable for assistive technologies, while a custom tooltip provides stronger interactivity.
    HTML Tutorial . Web Front-end 702 2025-07-16 04:47:21
  • How to make a div focusable?
    How to make a div focusable?
    To get the div to focus, the core method is to add the tabindex attribute. 1. Use tabindex="0" to make the div focus in the default tab order; 2. tabindex="-1" allows focus through JavaScript but not in the tab process; 3. Avoid using values greater than 0 to avoid disrupting the tab order. At the same time, you should ensure that there is visual feedback when focusing, such as setting the div:focus style with CSS and retaining or replacing the outline to ensure barrier-free access. Optionally, keyboard events can also be monitored to enable interactive operations. In addition, pay attention to semantics, give priority to using buttons or using ARIA attributes to improve barrier-freeness
    HTML Tutorial . Web Front-end 718 2025-07-16 04:46:52
  • How to embed a YouTube video in HTML
    How to embed a YouTube video in HTML
    To embed YouTube videos in a web page, you can directly copy the embedded code provided by YouTube and paste it into the HTML page; 1. Open the target video page and confirm the correct video link; 2. Click "Share" → "Embed" to copy the generated iframe code; 3. Or manually create the iframe tag and set the src to https://www.youtube.com/embed/video ID; 4. It is recommended to use responsive width and add allowfullscreen attributes; 5. Advanced suggestions include using containers to achieve 16:9 ratios, delay loading to improve performance, and pay attention to privacy policy tips.
    HTML Tutorial . Web Front-end 1005 2025-07-16 04:43:11
  • How to implement a dark mode toggle on an HTML website?
    How to implement a dark mode toggle on an HTML website?
    ToaddadarkmodetoggletoanHTMLwebsite,createabuttoninHTML,definedarkmodestylesinCSSusingaclass,anduseJavaScripttotoggletheclassandoptionallysaveuserpreferencewithlocalStorage.1.AddabuttonelementwithanIDfortoggling.2.DefinedefaultanddarkmodestylesusingC
    HTML Tutorial . Web Front-end 359 2025-07-16 04:42:21
  • What is the role='presentation' and role='none' in ARIA?
    What is the role='presentation' and role='none' in ARIA?
    role="presentation" and role="none" are used to hide elements in HTML that are meaningless to screen readers. The main difference is in the usage scenario: role="presentation" is often used for layout or decorative elements, such as semantic divs, spans or icons; role="none" is mostly used for the internal structure of ARIA components to avoid child elements being exposed separately. Neither should be applied to interactive elements or elements containing important information. Before use, you should confirm whether the element is only used for layout, whether it is duplicated with existing information, and whether it will improve the accessibility experience after being hidden.
    HTML Tutorial . Web Front-end 215 2025-07-16 04:42:02
  • How to create a multi-submit button form using formaction?
    How to create a multi-submit button form using formaction?
    In HTML forms, you can use the formatting attribute to implement multiple submit buttons for a form to submit to different addresses separately. 1. Multiple submission buttons are used to submit to different interfaces according to different operations, such as "Save Draft" and "Publish Article". 2. Use the formation property to specify the submission address of the button, which represents the default action of the single. 3. It can be used to achieve more flexible submission behavior with formmethod, formtarget, formenctype and other properties. 4. Pay attention to compatibility and data structure consistency when using it, and it is recommended to test whether the submitted address is correct.
    HTML Tutorial . Web Front-end 239 2025-07-16 04:38:11
  • What is the difference between void and non-void elements?
    What is the difference between void and non-void elements?
    In HTML, elements are divided into two main types: void element and non-void element. 1. Void elements contain no content and do not have closed tags, such as,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, 2. The Non-void element has starting and closing tags, which can wrap content, such as, ,, and. These elements can nest other elements and build complex structures. 3. Correctly distinguishing the two can help avoid HTML errors, such as placing content inside a void element is invalid, and missing closed tags for non-void elements may cause rendering exceptions or style issues. Therefore, use void elements to implement independent functions, use non-void elements to wrap content, and
    HTML Tutorial . Web Front-end 314 2025-07-16 04:37:48
  • Designing and Validating HTML Forms for User Input
    Designing and Validating HTML Forms for User Input
    Designing and verifying HTML forms requires both user experience and data accuracy. 1. Use appropriate form elements to improve the interactive experience and assist the browser to identify the input type, such as inputtext for text, inputpassword for password, radio for single choice, checkbox for multiple choice, and select for pull-down option; 2. Use HTML5 built-in verification function to reduce JavaScript workload, including required attribute, type=email/url automatic format verification, and min/max/pattern restriction input; 3. Back-end verification cannot be omitted, and it is necessary to check whether the field is empty, verification format, filter sensitive content, and limit input length
    HTML Tutorial . Web Front-end 151 2025-07-16 04:37:40
  • Defining Base URLs for Relative Paths Using the HTML base Tag
    Defining Base URLs for Relative Paths Using the HTML base Tag
    Tags are used to uniformly manage the reference addresses of all relative paths in HTML pages and must be placed in the area. 1. It specifies a basic URL so that the relative paths in the page are resolved based on the address; 2. Correct use includes putting it in, only having one tag, and specifying target and href at the same time; 3. Notes include the path that needs to be complete, affecting all relative paths, and may conflict with the front-end route; 4. Suitable for scenarios such as fixed website structure, development of static sites, and controlling link opening methods. Rational use can reduce path confusion, but attention should be paid to its global impact.
    HTML Tutorial . Web Front-end 297 2025-07-16 04:37:18
  • What is the cite attribute on a blockquote?
    What is the cite attribute on a blockquote?
    The cite attribute of the tag specifies the source of the reference text. 1. It informs the source of the reference by providing the URL, 2. Improves accessibility and SEO, and 3. Keeps the HTML structure clean. The source is not displayed by default, but can be displayed via CSS or tooltips. When using it, make sure the link is valid and authentic and avoid abuse. If you need to see the source, additional elements such as such should be added.
    HTML Tutorial . Web Front-end 276 2025-07-16 04:07:58

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