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  • What is the difference between the main axis and the cross axis in Flexbox?
    What is the difference between the main axis and the cross axis in Flexbox?
    ThemainaxisinFlexboxisdeterminedbytheflex-directionproperty,runninghorizontallywithrowandverticallywithcolumn,whilethecrossaxisisalwaysperpendiculartoit.Themainaxisisthedirectioninwhichflexitemsarelaidout,setusingflex-direction:row(horizontal)orflex-
    CSS Tutorial . Web Front-end 182 2025-07-01 00:21:51
  • What is the new :has() relational pseudo-class?
    What is the new :has() relational pseudo-class?
    The:has()pseudo-classinCSSallowsyoutoselectelementsbasedontheirchildordescendantelements.1.Itenablesconditionalstyling,suchasselectingalinkthatcontainsanimage.2.Thesyntaxisselector:has(selector-or-combinator),forexamplea:has(img).3.Itchecksforanymatc
    CSS Tutorial . Web Front-end 739 2025-07-01 00:02:01
  • How to select all anchor tags that open in a new tab using attribute CSS Selectors for target='_blank'?
    How to select all anchor tags that open in a new tab using attribute CSS Selectors for target='_blank'?
    To select all tags that open in a new tab page, use the a[target="_blank"] attribute selector, which is direct and effective. Through this selector, you can add styles such as colors, icons, etc. to it, for example: a[target="_blank"]{color:red;padding-right:20px;background:url('external-icon.png')no-repeatrightcenter;}. If no effect is seen, check 1. Whether the CSS priority is sufficient; 2. Whether the HTML structure is correct; 3. Whether there is a caching problem.
    CSS Tutorial . Web Front-end 272 2025-06-30 01:20:41
  • What are the pros and cons of utility-first CSS frameworks like Tailwind CSS?
    What are the pros and cons of utility-first CSS frameworks like Tailwind CSS?
    Choosing whether to use a practically preferred CSS framework such as TailwindCSS depends on project requirements and team configuration. On the one hand, this type of framework accelerates the development of common UI components by providing low-level classes (such as flex, p-4, text-lg), avoids naming conflicts and improves consistency, and is especially suitable for teams composed of non-CSS experts; on the other hand, for projects with unique visual brands or large number of customized designs, reusing long list of practical classes may lead to code redundancy, HTML bloat and maintenance difficulties; in addition, tools such as Tailwind require time to configure and have a certain learning curve for developers who are not familiar with the system, but the problem can be alleviated through editor plug-ins, preset configurations and unified naming specifications. Therefore, if the team can take it
    CSS Tutorial . Web Front-end 642 2025-06-30 01:18:11
  • How does the order property in Flexbox work?
    How does the order property in Flexbox work?
    TheorderpropertyinFlexboxcontrolsthevisualorderofflexitemsindependentlyoftheirHTMLsourceorderbyassigningnumericalvalues,wherelowernumbersappearfirst.1.Bydefault,allitemshaveorder:0.2.Itemsaresortedvisuallybasedonascendingnumericalvalues.3.Itemswithth
    CSS Tutorial . Web Front-end 205 2025-06-30 01:15:41
  • CSS tutorial explaining the z-index property
    CSS tutorial explaining the z-index property
    Tocontrolwhichoverlappingwebpageelementappearsontop,usetheCSSz-indexpropertywithpositionedelements.Thez-indexassignsastackingorderwherehighervaluesappearabovelowerones,butonlyworksonelementswithpositionsettorelative,absolute,fixed,orsticky.Stackingco
    CSS Tutorial . Web Front-end 586 2025-06-30 01:15:01
  • What is the mask-image property?
    What is the mask-image property?
    mask-image is an attribute in CSS to apply an image as a mask layer to an element. It controls which parts of the element are visible through the transparency (alpha channel) or brightness (grayscale value) of the image, where the white area fully displays the element, the black area hides the element, and the gray area displays the translucent effect. Common uses include creating custom shapes, displaying content progressively, and designing overlay visual effects. When using it, it is recommended to use PNG images with transparency, and combine mask-repeat, mask-position and mask-size properties to adjust the mask performance. Pay attention to browser compatibility issues and provide alternative styles. For example: .masked{background:url('p
    CSS Tutorial . Web Front-end 378 2025-06-30 01:09:21
  • What are the basics of a CSS tutorial for absolute beginners?
    What are the basics of a CSS tutorial for absolute beginners?
    Beginners of CSS should first understand how they collaborate with HTML, master the CSS rules and structure, learn text and color styles, and understand the basics of layout. The article points out that HTML builds a web structure, and CSS is responsible for visual styles, connecting CSS and HTML through link tags; CSS rules are composed of selectors and declaration blocks; common attributes include color, font, alignment, etc.; each element consists of content, inner margins, borders, and outer margins to form a box model, and the display type can be controlled through block, inline, and inline-block. It is recommended to gradually explore the Flexbox or Grid layout starting from simple margin adjustment.
    CSS Tutorial . Web Front-end 1010 2025-06-30 01:08:21
  • Simple CSS animation tutorial for beginners
    Simple CSS animation tutorial for beginners
    The key to CSS animation is to master the use of @keyframes and animation attributes. 1. @keyframes is used to define animation keyframes, and set the state of different stages of the animation through from/to or percentage; 2. The animation attribute applies animation to elements, including settings such as name, duration, easing function, delay and number of playbacks; 3. The code can be simplified by abbreviated attributes, and the effect of staggered playback of multiple elements is achieved using animation-delay; 4. Pay attention to browser compatibility, performance optimization, triggering methods and keeping animations simple. By mastering these core points, you can easily create smooth and beautiful CSS animations.
    CSS Tutorial . Web Front-end 678 2025-06-30 01:04:40
  • What is the difference between position: relative, absolute, fixed, and sticky?
    What is the difference between position: relative, absolute, fixed, and sticky?
    The position attribute has four values: relative, absolute, fixed, and sticky, and their behaviors are different. 1. Relative: The element is offset from its original position and is still in the document flow; 2. Absolute: Depart from the document flow, positioning relative to the nearest positioning ancestor elements; 3. Fixed: Depart from the document flow, always positioning relative to the viewport, keeping the position unchanged when scrolling the page; 4. Sticky: Between relative and fixed, according to the scroll position switching behavior, you need to specify top, bottom and other values ??to take effect, which are often used to fix the header or sidebar.
    CSS Tutorial . Web Front-end 687 2025-06-30 01:03:21
  • How to debug common problems CSS tutorial
    How to debug common problems CSS tutorial
    Use browser developer tools to check elements to view the styles and possible coverage issues of the actual application; 2. Check CSS syntax errors, such as missing semicolons, spelling errors, etc.; 3. Confirm that the style sheet is correctly linked, and there are no 404 errors or path issues; 4. Pay attention to layout problems such as fold margins and floating not cleared to affect the layout. Debugging CSS requires combining tools and basic checks. Most problems are caused by common errors or overwrite logic.
    CSS Tutorial . Web Front-end 596 2025-06-30 01:02:21
  • Which CSS Selectors are the most performant and why?
    Which CSS Selectors are the most performant and why?
    The best performance of CSS is usually ID and class selector. 1. ID selectors are the fastest, because their uniqueness makes the browser stop immediately after searching, which is suitable for single-style applications; 2. Class selectors are balanced and reusable, suitable for most style tasks; 3. Avoid excessive nesting or complex selectors (such as pseudo-classes, attribute selectors), because their parsing is slow, especially in large projects. Prioritize the use of simple selectors to improve rendering efficiency and maintain code maintenance.
    CSS Tutorial . Web Front-end 135 2025-06-30 01:01:11
  • How to use the :not() pseudo-class in CSS Selectors to exclude elements?
    How to use the :not() pseudo-class in CSS Selectors to exclude elements?
    The :not() pseudo-class of CSS applies styles by excluding specific elements, such as div:not(.special) selects all divs except .special class. The core points are as follows: 1. Only one selector can be used in:not(). If you need to exclude multiple ones, such as p:not(.intro):not(.outro); 2. You can combine them with other selectors to implement dynamic styles, such as a:not([href^="http://"]); 3. Avoid excessive nesting to keep the code clear and easy to maintain.
    CSS Tutorial . Web Front-end 423 2025-06-30 00:58:41
  • How does the transform-origin property work?
    How does the transform-origin property work?
    Transform-origin is used to change the center point of CSS transformation, and is the center of the element by default. Different origins can be specified by setting keywords, percentages or length values, such as topleft or 10px20px. It is often used to achieve animation effects starting from corners or edges when rotating or scaling. Typical application scenarios include rotating the panel from the corner, scaling elements from one side, and coordinating transition animations with layout changes. Note that the percentage is based on the element itself rather than the parent container, and the transformation of the origin only affects the visual presentation process without changing the final position. When using it, avoid missing actual transform properties and ensure browser compatibility testing.
    CSS Tutorial . Web Front-end 878 2025-06-30 00:53:00

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