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  • How to center a div in CSS
    How to center a div in CSS
    To center a div, you can use the following methods: 1. Use margin:0auto horizontally and centered block-level elements, and set the width; 2. Flexbox layout achieves horizontal and vertical centering through display:flex, justify-content and align-items, and the parent container needs to have a height; 3. Use display:grid and place-items:center in Grid layout; 4. Absolute positioning combined with transform:translate (-50%,-50%), suitable for elements that are separated from document flow. Each approach is suitable for different scenarios and can be selected based on structure and compatibility.
    CSS Tutorial . Web Front-end 636 2025-07-24 03:30:11
  • What is a stacking context in CSS
    What is a stacking context in CSS
    Stackingcontext is created in CSS through specific attributes, which determines the order in which elements stack on the z-axis. Common ways of creating include: 1. Set position to relative, absolute, fixed or sticky and cooperate with z-index; 2. Use opacity less than 1; 3. Use transform, filter, will-change and other properties; 4. Set isolation:isolate. Once created, the child elements will be stacked in the environment, and the levels between different stacking contexts cannot be interspersed. The level comparison requires consideration of the hierarchy depth of the stacking context.
    CSS Tutorial . Web Front-end 461 2025-07-24 03:27:31
  • The `itemref` Attribute for Microdata
    The `itemref` Attribute for Microdata
    itemref is an attribute in Microdata that is used to disperse content in associated pages. Its main purpose is to enable elements that do not belong to the current item scope to become part of the object, thereby realizing remote reference. The usage methods include: 1. Add item scope and unique id to the main object; 2. Use itemref to refer to the id of other elements on the main object; 3. The referenced element must have itemprop and the id is consistent with the itemref list. Applicable scenarios include layout restrictions, multiplexing structures, CMS systems, etc. Notes include: It can only be used for elements with item scope, the target element must be the same page, the id must be unique, not all tools support itemref, it is recommended to make
    HTML Tutorial . Web Front-end 180 2025-07-24 03:19:51
  • How to override CSS styles
    How to override CSS styles
    To solve the problem that CSS styles are not effective, you need to understand the priority and casing mechanism and adopt the following methods: 1. Use more specific selectors to increase priority, such as ID selectors or combination selectors; 2. Use !important to force overwrite when necessary, but be cautious about avoiding abuse; 3. Use @layer or adjust the style sheet loading order to control the casing order; 4. Use browser developer tools to check the style source and overwrite situation. These methods are arranged in order of priority and practicality, which helps to solve problems accurately.
    CSS Tutorial . Web Front-end 871 2025-07-24 03:18:10
  • HTML `placeholder` Attribute for Input Fields
    HTML `placeholder` Attribute for Input Fields
    The placeholder property is an auxiliary function in HTML forms for input box prompts. It displays light text when the input box is empty, and it will automatically disappear after the user starts input. The correct way to use it is to use it as a supplementary description rather than replace label tags. The specific steps are: 1. Use label and placeholder at the same time, such as username: 2. Avoid labeling required items or providing key information with placeholder; 3. Control the length of the prompt text to keep it simple; 4. Adjust the style through CSS to ensure compatibility; 5. Applicable to input scenarios with clear formats such as email, search boxes, etc., and password boxes should be used with caution.
    HTML Tutorial . Web Front-end 552 2025-07-24 03:08:51
  • HTML `track` Element for Video Captions and Subtitles
    HTML `track` Element for Video Captions and Subtitles
    The track element is a tag in HTML5 that is used to add text tracks to videos. It supports subtitles, titles, descriptions, chapters, and metadata, and is usually made using WebVTT format files. 1. When using it, you need to add and specify properties such as src, kind, srclang, label, etc. 2. The WebVTT file format must start with WEBVTT and include timestamps and contents. 3. Mainstream browsers support track but limited style control. 4. Multiple tracks can be added to achieve multilingual support. Correct use of track can improve video accessibility and user experience.
    HTML Tutorial . Web Front-end 529 2025-07-24 03:06:42
  • How to create a triangle shape with CSS?
    How to create a triangle shape with CSS?
    The core method of creating triangles with CSS is to use border properties to display specific parts by setting elements with width and height of 0 and adjusting the color and transparency of the border. The specific steps are as follows: 1. Create a div with a width and height of 0; 2. Set borders in different directions, such as border-left, border-right and border-bottom, and set the borders that do not need to be displayed as transparent; 3. Create the desired shape by adjusting the border size and color, for example, an upward facing isosceles triangle can be used to combine border-bottom:100pxsolid#333 with left and right transparent borders; 4. Change the direction of the colored borders to control the orientation of the triangle (upper, down,
    CSS Tutorial . Web Front-end 546 2025-07-24 03:04:21
  • How to handle CSS in different browsers (cross-browser compatibility)
    How to handle CSS in different browsers (cross-browser compatibility)
    To deal with CSS compatibility issues, we need to start from four aspects: 1. Use Normalize to unify basic styles to avoid default style differences; 2. Query the support of CSS features and provide a fallback solution, add a manufacturer prefix or use Polyfill; 3. Ensure style consistency through developer tools and multi-browser testing; 4. Automatically add manufacturer prefixes to improve compatibility.
    CSS Tutorial . Web Front-end 391 2025-07-24 03:03:01
  • Implementing HTML `contenteditable` for Rich Text Editors
    Implementing HTML `contenteditable` for Rich Text Editors
    TobuildarichtexteditorusingHTML’scontenteditableattribute,startbymakinganelementeditablewithcontenteditable="true",thenhandleformattingwithJavaScriptviaexecCommandorDOMmanipulation.1.Usecontenteditableonelementslikeorfordirectediting.2.Hand
    HTML Tutorial . Web Front-end 636 2025-07-24 03:00:52
  • HTML Event Attributes: `onclick`, `onmouseover`, etc.
    HTML Event Attributes: `onclick`, `onmouseover`, etc.
    Common HTML event attributes include onload, onchange, onsubmit, onmouseout, onkeydown and onkeyup; onclick is used to respond to click behavior, and it is recommended to achieve interaction through function calls or JS binding; onmouseover and onmouseout are often used for hovering effects; it is recommended to use addEventListener to achieve event binding for maintenance and extension.
    HTML Tutorial . Web Front-end 252 2025-07-24 02:59:41
  • Working with HTML `details` and `summary`
    Working with HTML `details` and `summary`
    details and summary tags can achieve folding and expansion effects without JavaScript. 1. Details is used as a container, and the content is hidden by default; 2. summary is used as the title to open and close; 3. You can customize the style through CSS, such as removing the default arrows, setting backgrounds and padding; 4. Applicable to FAQ, setting panels and other scenarios; 5. Pay attention to browser compatibility and structural correctness, and summary must be placed inside details.
    HTML Tutorial . Web Front-end 963 2025-07-24 02:56:13
  • Understanding HTML `formaction` Attribute
    Understanding HTML `formaction` Attribute
    Formaaction is an attribute in an HTML form that specifies the independent submission address of a specific submission button, which overrides the form's default action attribute. 1. It allows setting different submission paths for different buttons, such as "Save" and "Preview". 2. When using it, it is directly added to the button of type="submit", and the syntax is format="url". 3. It can be used in combination with other attributes such as formmethod, formctype, and formtarget to achieve flexible submission behavior. 4. The priority of this property is higher than the action of the form, and the path can be a relative or absolute path. 5. Commonly used for many
    HTML Tutorial . Web Front-end 715 2025-07-24 02:53:42
  • Using `target='_blank'` Safely in HTML
    Using `target='_blank'` Safely in HTML
    When using target="_blank", rel="noopener" must be added at the same time to prevent security vulnerabilities. The reason is that the new page can control the original page through window.opener, causing phishing or redirecting attacks. The correct way to write it is:. If you need to affect SEO, you can add nofollow: rel="noopenernofollow". Scenarios that need special attention include: 1. User-submitted links; 2. Content generated by third-party plug-ins or CMS; 3. Advertising or cooperative links. In addition, target="_blank" should be used with caution,
    HTML Tutorial . Web Front-end 826 2025-07-24 02:52:51
  • HTML Geolocation API Basics
    HTML Geolocation API Basics
    GeolocationAPI obtains user location information through navigator.geolocation.getCurrentPosition() method, which requires user authorization and support HTTPS. First, check whether the browser supports the API; second, call getCurrentPosition() to obtain location information and handle possible errors; finally, develop in combination with actual application scenarios such as weather, maps, etc. When using it, you should pay attention to permission control, privacy protection, equipment differences and compatibility issues.
    HTML Tutorial . Web Front-end 198 2025-07-24 02:47:52

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