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  • Understanding css specificity and how it is calculated
    Understanding css specificity and how it is calculated
    CSS specificity is the core mechanism that determines the priority of styles, and determines which rule takes effect through the weight calculation of the selector. Inline styles score 1000 points, ID selectors score 100 points each, classes, attributes, and pseudo-classes score 10 points each, elements and pseudo-elements score 1 point each; different categories scores cannot be carried; for example, ten class selectors (100 points) are still lower than one ID (100 points). Abuse of !important should be avoided, understanding the order of inheritance and cascade, and analyzing style conflicts with browser tools.
    CSS Tutorial . Web Front-end 671 2025-07-13 03:07:10
  • Using css custom properties (variables) for maintainability
    Using css custom properties (variables) for maintainability
    Using CSS variables can effectively improve style maintainability. 1. By unified designing the basic elements of the system such as colors, fonts, etc., global calls and modifications are realized, such as defining --color-primary and reusing them in multiple components; 2. Component-level variables support local customization, such as setting independent margins and background colors for card components; 3. Dynamically switch variable values in combination with media query to achieve responsive design; 4. Good naming and organizational methods, such as semantic naming and module grouping, helping team collaboration. Use CSS variables reasonably to make the project easier to maintain and expand.
    CSS Tutorial . Web Front-end 998 2025-07-13 03:06:51
  • How to create a sticky header or footer using css position sticky
    How to create a sticky header or footer using css position sticky
    To implement stickyheader or footer, the key is to use position:sticky correctly. When implementing stickyheader, you need to set position:sticky and top:0, and make sure that the parent container does not have overflow:hidden. It is recommended to add z-index to prevent overwriting; 1. Stickyheader does not detach from the document flow, and is fixed when scrolling to the top, and does not affect the layout of other content; 2. When implementing stickyfooter, you need to wrap the main content and set footer's position:sticky and bottom:0, but it only takes effect when the content is less than one screen; 3. When using sticky, you need to
    CSS Tutorial . Web Front-end 302 2025-07-13 03:03:20
  • Implementing text overflow ellipsis with CSS
    Implementing text overflow ellipsis with CSS
    Text overflow ellipsis can be implemented through CSS. Use white-space:nowrap, overflow:hidden, and text-overflow:ellipsis for single lines; use display:-webkit-box, -webkit-box-orient:vertical, and -webkit-line-clamp to control the number of lines and cooperate with overflow:hidden. 1. A single line needs to set the width, otherwise it will not take effect; 2. Multiple lines need to specify the number of lines and rely on the support of WebKit browser; 3. Common problems include container size not limited, text overflow, layout interference or word-break influence
    CSS Tutorial . Web Front-end 879 2025-07-13 03:02:50
  • How to create an overlapping layout with CSS Grid?
    How to create an overlapping layout with CSS Grid?
    The key to using CSSGrid to achieve a cascade layout is the cooperation of grid-area and z-index. 1. Set the row and column ranges of different elements through grid-area to make them overlap in position; 2. Use position and z-index to control the stacking order of elements to let specific elements be displayed on the upper layer; 3. You can combine translucent background to achieve visual fusion effect; 4. For complex layouts, you can use grid-template-areas to name areas to simplify the structure, and manually specify the coverage area through grid-area. Mastering these methods can flexibly achieve various stacked layout effects.
    CSS Tutorial . Web Front-end 842 2025-07-13 02:56:10
  • What is the purpose of the content property in pseudo-elements?
    What is the purpose of the content property in pseudo-elements?
    The content attribute is used in CSS to insert generated content into a pseudo-element. Its core role is to add visual content in non-HTML structures, such as text, symbols, pictures, or automatic counters. 1. Insert text or symbols: can be used to add labels or icons, such as "Note:" or Unicode characters; 2. Add images or counters: supports inserting pictures and implementing automatic numbering; 3. Style control: styles such as fonts, colors and layouts can be applied to the generated content; 4. Use restrictions: It should be avoided to use critical information or large amounts of text to avoid affecting accessibility and maintenance.
    CSS Tutorial . Web Front-end 852 2025-07-13 02:50:50
  • Techniques for optimizing CSS performance and load times
    Techniques for optimizing CSS performance and load times
    CSS performance optimization can improve web page loading speed and user experience. The main methods include: 1. Reduce the CSS file size, use compression tools, delete redundant code, merge class names, and avoid global reset; 2. Use critical path CSS, extract and inline the required styles on the first screen, and delay loading of non-critical CSS; 3. Load non-critical CSS asynchronously, use media attributes, dynamic insertion or preload preload; 4. Optimize selectors and hierarchical structures, give priority to the use of class selectors, avoid long-chain nesting, and control specificity. These methods help speed rendering, reduce resource consumption, while taking into account maintainability.
    CSS Tutorial . Web Front-end 342 2025-07-13 02:36:50
  • How to build a modal or popup box CSS tutorial
    How to build a modal or popup box CSS tutorial
    To create a basic modal box or pop-up box, first build the structure using HTML, then style it through CSS, and optionally implement interaction using JavaScript. 1. The HTML part includes trigger buttons, modal box containers and contents; 2. CSS is used to set positioning, overlaying and centering effects; 3. JavaScript controls display and hide; 4. Responsive design recommends using percentage width and media query to adapt to different devices. The whole process is simple and effective and is suitable for most simple scenarios.
    CSS Tutorial . Web Front-end 685 2025-07-13 02:35:40
  • CSS Layout Showdown: Flexbox vs Grid - Which Wins?
    CSS Layout Showdown: Flexbox vs Grid - Which Wins?
    Flexboxisidealforone-dimensionallayouts,whileGridexcelsintwo-dimensionallayouts.1)UseFlexboxforaligningitemsinasingleroworcolumn,perfectfornavigationmenusorgalleries.2)UseGridforcomplexlayoutsrequiringcontroloverbothrowsandcolumns,idealfordashboards.
    CSS Tutorial . Web Front-end 102 2025-07-13 02:34:11
  • Explaining the CSS position property differences
    Explaining the CSS position property differences
    The position attribute is a key attribute in CSS that controls the positioning of elements. Common values include static, relative, absolute, fixed, and sticky. static is the default value, and elements are arranged according to the document flow and are not affected by the positioning attributes; relative causes the element to shift relative to its own position but remains in the document flow; absolute allows the element to be positioned based on the most recent non-static positioned ancestor elements and detached from the document flow; fixed is positioned with the viewport as the reference and maintains a fixed position when scrolling; sticky is fixed after scrolling to a specific position, between relative and fixed, and the direction value needs to be specified and the parent element cannot be overfl
    CSS Tutorial . Web Front-end 451 2025-07-13 02:33:31
  • Styling links with pseudo-classes: :link, :visited, :hover, :active in css
    Styling links with pseudo-classes: :link, :visited, :hover, :active in css
    Defining link styles in sequence can avoid overwriting problems. The specific steps are: 1. First set the basic styles of: link (not accessed) and: visited (visited); 2. Then add transition effects and underscores through:hover; 3. Use:active (activate) to achieve click sinking or background changes; 4. Pay attention to the need to optimize the touch feedback of: active on the mobile terminal. At the same time, make sure that the color of the visited link has sufficient contrast and keep the overall style simple and unified.
    CSS Tutorial . Web Front-end 593 2025-07-13 02:25:40
  • Managing overflow content with css overflow property
    Managing overflow content with css overflow property
    When the content exceeds the container, it is necessary to use the overflow attribute of the CSS. Common scenarios include too long pop-up windows, truncated card information, and displaying some content in fixed height areas. How to use: 1. overflow: visible default overflow displays external; 2. overflow:hidden hides overflow content; 3. overflow:scroll always displays scroll bars; 4. Overflow:auto automatically displays scroll bars when it exceeds. Implementing the ellipsis effect requires other attributes: use white-space:nowrap and text-overflow:ellipsis to achieve single line omission, and use -webkit-line-clam to omit multiple line omissions
    CSS Tutorial . Web Front-end 504 2025-07-13 02:18:20
  • Implementing responsive images with CSS properties like object-fit
    Implementing responsive images with CSS properties like object-fit
    To make the images appear properly on different devices, object-fit, responsive layout and srcset technology are required. 1.Object-fit controls the image scaling method. Common values include fill, contain, cover, scale-down, which is suitable for img and video elements; 2. Use @media query to realize layout adjustments under different screens, such as full width of the mobile phone and side-by-side display on the desktop; 3. Through srcset and sizes, let the browser select appropriate image resources according to the viewport to improve loading performance; 4. Pay attention to setting width and height to prevent layout jitter, avoid misuse of object-fit in the background image, optimize the quality of the original image and fully test compatibility.
    CSS Tutorial . Web Front-end 349 2025-07-13 01:40:41
  • Choosing between CSS Grid and Flexbox for layout tasks
    Choosing between CSS Grid and Flexbox for layout tasks
    Flexbox is more suitable for one-dimensional layouts, such as navigation bars and button groups; Grid is more suitable for two-dimensional layouts, such as the overall structure of the page. Flexbox is good at flexible alignment and responsive arrangement of single rows or single columns, suitable for horizontal or vertical centering and internal content layout of cards; Grid supports simultaneous control of rows and columns, suitable for complex page frames, dashboards and other scenarios. Judgment criteria: Flexbox is used for one-dimensional layout, Grid is used for two-dimensional layout; Grid is preferred for multiple independent areas, and Flexbox is used for alignment and sorting dynamic scaling. The two can also be mixed, such as Grid as structure, and internal blocks are arranged using Flexbox. Tips: Grid named area improves readability, Flex children need to add flex-wrap to wrap
    CSS Tutorial . Web Front-end 998 2025-07-13 01:31:01

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