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  • HTML `sizes` Attribute for Link Elements
    HTML `sizes` Attribute for Link Elements
    The sizes attribute can be used on elements, especially to define web icons. A common scenario is to provide multiple sizes of favicon for the website, such as 16x16, 32x32, 48x48, etc., so that the browser can choose the most suitable size according to the display needs. Its function is to clearly identify the actual size of the icon, helping the browser to make precise selections, especially to improve clarity on high-resolution screens. Common usages include standard favicon and AppleTouchIcon (such as 180x180). Notes include: NxN format must be written, and words such as small, large cannot be used; although some browsers can automatically scale, it is recommended to always add the sizes attribute to ensure compatibility and display effect; use tools
    HTML Tutorial . Web Front-end 963 2025-07-17 03:16:11
  • Implementing HTML `audio` Controls and Autoplay
    Implementing HTML `audio` Controls and Autoplay
    To achieve automatic playback and control bar display of audio in web pages, you need to use HTML attributes correctly and deal with browser policies. First, add controls attributes to the audio tag to display the control bar, and the writing method is; second, implementing automatic playback requires user interaction or audio muted, the common method is to add autoplay and muted attributes; third, if you need to unmute, you can call play() in user interaction events through JavaScript and set muted=false; fourth, mobile terminal restrictions are stricter, and it is recommended to provide a play button to trigger playback by the user; fifth, to improve compatibility, a variety of audio formats can be provided using the source tag.
    HTML Tutorial . Web Front-end 143 2025-07-17 03:13:42
  • Understanding the HTML `link rel='preload'` directive
    Understanding the HTML `link rel='preload'` directive
    rel="preload" is used to prioritize the loading of critical resources. It downloads key resources in advance, such as CSS, JS, fonts and important images on the first screen, but needs to be used with normal references; it is suitable for resources that have not been discovered in time or are difficult to detect; it needs to correctly set as attributes and CORS to avoid excessive use when implementing them; common errors include loading non-critical resources, missing as attributes or mistakes to replace other optimization methods.
    HTML Tutorial . Web Front-end 589 2025-07-17 03:09:11
  • Creating Buttons with the HTML `button` Tag
    Creating Buttons with the HTML `button` Tag
    Buttons are the core element of web interaction, and are most direct to creating using HTML tags. 1. The basic usage is to put text between the tags. If you click me, the default style can be displayed and the event can be triggered; 2. The type attribute defines behavior, including button, submit, reset, which is submitted by default; 3. Use the disabled attribute to disable buttons to prevent repeated submissions; 4. Customize the styles through class or style, it is recommended to use class for easy maintenance. Although the button is simple, you need to pay attention to the details when using it well.
    HTML Tutorial . Web Front-end 899 2025-07-17 02:57:02
  • The HTML `async` and `defer` Attributes for Scripts
    The HTML `async` and `defer` Attributes for Scripts
    Async and defer both load scripts asynchronously but have different execution timings. 1. Async is executed immediately after the download is completed, and does not block HTML parsing. It is suitable for scenarios where there is no need to rely on DOM or wait for other scripts, such as statistics and advertising scripts, and the execution order is uncertain; 2. Defer is delayed until the HTML parsing is completed and executed in the order of occurrence. It is suitable for scripts that need to access the complete DOM or depend on the page structure to ensure the execution order. When using it, you should avoid mixing the two and choose according to actual needs to improve performance.
    HTML Tutorial . Web Front-end 187 2025-07-17 02:52:31
  • HTML `input` `min` and `max` Attributes for Numeric Inputs
    HTML `input` `min` and `max` Attributes for Numeric Inputs
    In HTML forms, using the min and max attributes limits the range of numbers entered by the user. 1. They are suitable for elements of type number, range, and date, for example, they can limit the input value between 1 and 100; 2. When submitting the form, the browser will verify whether the input meets the requirements of min and max, but will not prevent the user from entering illegal characters or values beyond the range; 3. Non-digit input will not trigger min and max verification, and additional form verification is required; 4. The decimal places can be controlled in combination with step attributes, such as price input; 5. Use the oninput event and JavaScript to achieve real-time restrictions when input.
    HTML Tutorial . Web Front-end 376 2025-07-17 02:51:41
  • Progress Bars and Meters with HTML5
    Progress Bars and Meters with HTML5
    Used for dynamic task progress, used for static metric values. 1. It indicates that tasks with clear starting point and end point, such as file upload, supports value and max attributes, and can be updated dynamically; 2. The measurement values within the display range, such as battery percentage, include min, max, low, high and optimum attributes, affecting color rendering; 3. Both can be beautified through CSS, but there are differences in browser compatibility and display effects. If necessary, div can be used to simulate the progress bar.
    HTML Tutorial . Web Front-end 862 2025-07-17 02:50:01
  • HTML `output` Element for Client-Side Calculation Display
    HTML `output` Element for Client-Side Calculation Display
    TheHTMLelementisidealfordisplayingclient-sideformcalculationresults.1.Itprovidessemanticmeaning,makingitrecognizabletoassistivetechnologiesasaresultarea.2.Itsupportstheforattributetoassociatewithspecificinputelements,similarto.3.Itflowsnaturallywithi
    HTML Tutorial . Web Front-end 435 2025-07-17 02:47:02
  • HTML `link rel='dns-prefetch'` for Performance
    HTML `link rel='dns-prefetch'` for Performance
    dns-prefetch improves loading speed by resolving external domain names in advance. Specifically, it allows the browser to parse the DNS of third-party resources when it is idle, reducing the delay in subsequent requests. Suitable for references to multi-domain static resources, key third-party services, and links that users may click on. Abuse should be avoided during use, priority should be given to key resources, and can be used with preconnect. For example: add dns-prefetch to GoogleAnalytics and CDN, while key resources such as fonts are more efficient with preconnect.
    HTML Tutorial . Web Front-end 999 2025-07-17 02:46:21
  • HTML Validation: Ensuring Correct Markup
    HTML Validation: Ensuring Correct Markup
    HTML verification is a process of checking whether the code complies with standard specifications. Its functions include improving compatibility, facilitating SEO, facilitating maintenance, and reducing bugs. Common methods include using W3CMarkupValidationService, browser plug-in, or editor integration tools. Common errors such as unclosed labels, unquoted attribute values, incorrect use of self-closed labels, nesting errors, etc., all need to be corrected according to the specifications.
    HTML Tutorial . Web Front-end 892 2025-07-17 02:30:12
  • The HTML `link rel='canonical'` for SEO
    The HTML `link rel='canonical'` for SEO
    rel="canonical" is an HTML tag in SEO to solve duplicate content problems, centralized weights by specifying the "canonical version" page. It is placed in a web page and tells search engines which URL is the main version, such as in parameterized URLs, mobile and desktop pages, cross-domain copying of content, and similar pages automatically generated by CMS. Correct use requires ensuring that the tag is located in the head, pointing to the accessible page, being self-referencing, avoiding confusion with 301 jumps, and paying attention to URL consistency. Common errors include multiple pages pointing to each other, misplaced labels, coexisting noindex and canonical, and dynamic generation of errors.
    HTML Tutorial . Web Front-end 410 2025-07-17 02:28:52
  • The HTML `lang` Attribute for Language Semantics
    The HTML `lang` Attribute for Language Semantics
    The lang attribute not only improves SEO, but also optimizes accessibility and content understanding. ① Screen readers switch pronunciation methods according to this; ② Search engines judge page language based on this; ③ Browser translation function depends on this attribute. Common problems include missed writing and miswrites such as lang="chinese". It is recommended to use ISO639-1 codes such as zh or zh-CN. Generally written on the label, multilingual content needs to be marked separately. Incorrect settings will affect search rankings and visually impaired users' reading experience. In the application, you should ensure that the framework and server correctly inject language tags and check the format compliance.
    HTML Tutorial . Web Front-end 440 2025-07-17 02:24:22
  • Setting Default Values for HTML Input Fields
    Setting Default Values for HTML Input Fields
    There are three main ways to set the default value: First, use the value attribute to set the static default value for the input box, such as applicable to text boxes, numbers, mailboxes, etc., but not suitable for dynamic data; Second, placeholder is only used for prompts rather than default values, such as the user will not submit the value when it is not entered; Third, set the default value dynamically through JavaScript, such as combining event monitoring to fill area codes according to user operations, but pay attention to the issue of page loading assignment, user selection and synchronization with the backend. In addition, it is necessary to consider whether the default value is necessary, whether the user will misunderstand, whether the modified value is retained after the submission error, and the browser will automatically fill and overwrite the default value, etc. User experience and logical consistency issues such as whether the default value is necessary, whether the user will misunderstand, whether the modified value will be retained after the submission error, and whether the browser will automatically fill and overwrite the default value.
    HTML Tutorial . Web Front-end 1002 2025-07-17 02:17:02
  • HTML `details` and `summary` Tags Explained
    HTML `details` and `summary` Tags Explained
    HTML details and summary tags are used to create foldable content blocks, allowing you to click to expand or collapse without JavaScript. When using it, you need to put the title into the summary tag, and the rest of the content is placed in the details tag; it is suitable for scenarios such as FAQ, document description, etc.; it is recommended to keep summary short, avoid nesting complex elements, use CSS styles carefully, and conduct cross-browser testing; you can remove the default arrow icons through CSS and add custom styles and transition effects; it also has good built-in accessibility, but when customizing, you need to pay attention to retaining keyboard operation support and screen reader compatibility.
    HTML Tutorial . Web Front-end 791 2025-07-17 01:58:51

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