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  • What is the loading='lazy' one of the html attributes and how does it improve page performance?
    What is the loading='lazy' one of the html attributes and how does it improve page performance?
    loading="lazy" is an HTML attribute for and which enables the browser's native lazy loading function to improve page performance. 1. It delays loading non-first-screen resources, reduces initial loading time, saves bandwidth and server requests; 2. It is suitable for large amounts of pictures or embedded content in long pages; 3. It is not suitable for first-screen images, small icons, or lazy loading using JavaScript; 4. It is necessary to cooperate with optimization measures such as setting sizes and compressing files to avoid layout offsets and ensure compatibility. When using it, you should test the scrolling experience and weigh the user experience.
    HTML Tutorial . Web Front-end 997 2025-07-01 01:33:21
  • What is responsive web design, and why is it important?
    What is responsive web design, and why is it important?
    Responsive web design provides a high-quality user experience across devices by automatically adjusting layouts, pictures and functions to suit the screen sizes of different devices. It ensures that the text is readable, the buttons are easy to dot, and the image is not deformed, while improving SEO performance and reducing maintenance costs. Specifically, it includes: 1. Automatically reorder the content and hide non-essential elements; 2. Use a single URL to avoid content duplication problems; 3. Speed ??up loading and reduce bounce rate; 4. Flexible layout is achieved through media queries, elastic grids and adaptive pictures.
    HTML Tutorial . Web Front-end 699 2025-07-01 01:33:01
  • What are best practices for writing valid and well-formed HTML code?
    What are best practices for writing valid and well-formed HTML code?
    When writing legal and neat HTML, you need to pay attention to clear structure, correct semantics and standardized format. 1. Use the correct document type declaration to ensure that the browser parses according to the HTML5 standard; 2. Keep the tag closed and reasonably nested to avoid forgetting closed or wrong nesting elements; 3. Use semantic tags such as, etc. to improve accessibility and SEO; 4. The attribute value is always wrapped in quotes, and single or double quotes are used uniformly. Boolean attributes only need to exist, and the class name should be meaningful and avoid redundant attributes.
    HTML Tutorial . Web Front-end 309 2025-07-01 01:32:12
  • How do you control the appearance of and HTML tags?
    How do you control the appearance of and HTML tags?
    To control the appearance of tags in HTML, the core approach is to use HTML attributes with CSS styles. 1. Use built-in properties such as controls, autoplay, loop, muted and poster to achieve basic functional control; 2. Adjust the size, border, shadow and responsive layout of the video player through CSS to match the website design style; 3. If you need to fully customize the interface, you can remove the default controls and build the UI components yourself; 4. Use responsive design techniques to ensure that the video is displayed well on different devices, such as setting containers with an aspect ratio of 16:9 to avoid deformation.
    HTML Tutorial . Web Front-end 483 2025-07-01 01:30:51
  • What is the role in html attributes and how does it relate to ARIA for accessibility?
    What is the role in html attributes and how does it relate to ARIA for accessibility?
    TheroleattributedefineswhatanelementisordoeswhenusingnativeHTMLelementsisn’tpossible.1.Ittellsassistivetechnologieslikescreenreadershowtointerpretcustomcomponentsbuiltwithnon-semanticelementssuchasor.2.Commonrolesincludenavigation,button,alert,anddia
    HTML Tutorial . Web Front-end 1020 2025-07-01 01:30:32
  • What are the different ways to embed CSS styles in HTML (inline, internal, external)? What are their pros and cons?
    What are the different ways to embed CSS styles in HTML (inline, internal, external)? What are their pros and cons?
    There are three common ways to embed CSS styles in HTML: 1. Inline styles, suitable for one-time modifications, the advantages are that they are simple, direct and have high priority, but are not conducive to maintenance and reuse; 2. Internal style sheets, suitable for single pages, realize the separation of structure and styles, but are not conducive to unified management of multiple pages; 3. External style sheets, referenced by separate files, are most recommended to use, convenient for centralized management and browser caching, and are suitable for medium and large projects. The choice method should be determined based on project size, collaborative needs and personal habits.
    HTML Tutorial . Web Front-end 679 2025-07-01 01:22:52
  • How do I control video playback using the play(), pause(), and seek() methods?
    How do I control video playback using the play(), pause(), and seek() methods?
    To control video playback using JavaScript, use the play(), pause() and currentTime properties. First, set an element with controls attribute in HTML and use JavaScript to obtain the element; then playback can be started or resumed through the play() method, but user interaction needs to be triggered; then pause() method to pause to the current frame without resetting the time; finally use the currentTime attribute to jump to the specified time point, such as video.currentTime=30, it can jump to 30 seconds, and it can also be combined with event monitoring to ensure that the operation is completed. There is no need for external libraries in the entire process, but attention should be paid to the browser's automatic playback restrictions and cross-leveling
    HTML Tutorial . Web Front-end 389 2025-07-01 01:20:22
  • What are some common uses for the http-equiv and name html attributes in tags?
    What are some common uses for the http-equiv and name html attributes in tags?
    http-equiv is used to simulate HTTP response headers and control page cache, refreshing and other behaviors; name is used to provide metadata, affecting SEO and social sharing. 1. http-equiv can set character sets, compatibility modes, page refresh and cache strategies, such as implementing jumps; 2. Name can define description, keywords, authors, viewport and OpenGraph data, such as supporting responsive design; 3. When using it, avoid over-reliance on meta tags, keep the content accurate, and verify its effect through tools.
    HTML Tutorial . Web Front-end 515 2025-06-30 01:51:32
  • What are the content model rules that define which HTML tags can be nested inside others?
    What are the content model rules that define which HTML tags can be nested inside others?
    The HTML content model defines the nesting rules of tags to ensure reasonable structure and clear semantics. 1. Block-level elements (such as ,) occupy the entire line, and in-line elements (such as ,) only occupy the content space. In-line elements should not directly wrap block-level elements. 2. HTML5 introduces more fine-grained content models, such as flowcontent, sectioningcontent, phrasingcontent, etc., which can only include phrasingcontent, and must be included, must be located, or in. 3. The tags need to be properly paired. If they must be cooperated, they cannot be nested and can only be in the middle. 4. Although modern frameworks are tolerant of handling some errors, illegal structures may lead to rendering exceptions, SEO issues and barrier-free access barriers. It is recommended that
    HTML Tutorial . Web Front-end 283 2025-06-30 01:48:45
  • Where can I find a complete list of all html attributes?
    Where can I find a complete list of all html attributes?
    To find a complete list of HTML attributes, you should refer to the WHATWGHTMLLivingStandard or W3CHTML5 specification. 1. The WHATWG document provides all global and tag-specific attributes recognized by modern HTML; 2. Although the W3C document is not as frequent as WHATWG, it is equally reliable; 3. Global attributes are applicable to all elements, and some attributes are only for specific tags; 4. Non-standard attributes may be supported by the browser but cannot be verified; 5. MDNWebDocs provides easier-to-understand attribute classification, usage description and browser compatibility information; 6. Code editors such as VSCode can automatically complete attribute selection assistance; 7. Online verification tools such as W3CValidato
    HTML Tutorial . Web Front-end 247 2025-06-30 01:48:01
  • How do I use the type attribute to specify the type of input field?
    How do I use the type attribute to specify the type of input field?
    The type attribute in the HTML form is used to specify the input type, which affects the performance and function of the input box. Common types include: 1.text is used for text input; 2.password is used to hide passwords; 3.email is used to verify mailbox format; 4.number is used to limit digital input; 5.date provides date selector; 6.checkbox and radio implement multiple or single-select; 7.submit creates submission button. When using it, you can directly add type attributes to the input tag and set corresponding values. You can combine placeholder, min, max, required and other attributes to enhance the interactive experience. At the same time, pay attention to selecting according to the device optimization type to improve usability.
    HTML Tutorial . Web Front-end 633 2025-06-30 01:47:22
  • What are accessibility considerations in HTML, and why are they important?
    What are accessibility considerations in HTML, and why are they important?
    The core of making barrier-free design in HTML is to make the website available to everyone, including people with disabilities. There are four specific methods: 1. Use semantic tags such as reasonable title structure and form label binding to improve readability; 2. Add descriptive alt text to the picture and distinguish decorative pictures, and use text that clearly describes the target in the link; 3. Support keyboard navigation to ensure that interactive elements such as drop-down menus and modal boxes can be accessed logically through the Tab key; 4. ARIA attributes are used as supplements rather than substitutes, and native semantic tags are preferred, and only use ARIA to enhance interaction prompts when necessary.
    HTML Tutorial . Web Front-end 405 2025-06-30 01:47:03
  • How do I use the name attribute to give an input field a name that will be used when submitting the form?
    How do I use the name attribute to give an input field a name that will be used when submitting the form?
    Use the name attribute to define the field name when the form is submitted, and the server identifies the data type by this name. For example, name="email" will send user input as an email address. Correct usage methods include: 1. Use meaningful names such as username; 2. Avoid using spaces and special characters with first_name; 3. Keep the names of multiple forms consistent; 4. Share the names of related check boxes and add square brackets such as interests[]. Different input types handle differently. Radio buttons need to share names to ensure mutually exclusive selection. Different names should be used if the check box is independent. Common errors include missing name attributes, unrelated fields duplicate names, mismatch of front and back end names, etc., which may cause data to be located.
    HTML Tutorial . Web Front-end 927 2025-06-30 01:46:51
  • What are the most basic and essential HTML tags for a beginner?
    What are the most basic and essential HTML tags for a beginner?
    To start creating a simple web page, just master a few basic HTML tags. 1. Each web page requires a basic structure: use the entire content of the package, including metadata and title, and place visible content; 2. Use the title level to define the paragraph to organize the text content; 3. Use add links, insert pictures, and be sure to fill in the alt attribute to enhance accessibility. Use these tags correctly to build a complete and simple web page.
    HTML Tutorial . Web Front-end 927 2025-06-30 01:46:32

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