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- What are CSS pseudo-classes and pseudo-elements?
- Pseudo-classes are styles used to define element states, such as:hover and:focus; pseudo-elements create virtual content, such as::before and::after. A pseudo-class represents the state or positional relationship of an element, such as a button being clicked or a link being accessed; a pseudo-element is used to style a part of the content or insert virtual content, such as a first line of the paragraph or a placeholder for the input box. Pay attention to browser compatibility when using it. Pseudo-elements usually need to be matched with content attributes and avoid overuse to maintain style maintainability.
- CSS Tutorial . Web Front-end 352 2025-07-21 00:11:20
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- What is the cascade in CSS?
- In CSS, "cascade" refers to the browser's algorithm to resolve style conflicts. It determines which rule takes effect through selector specificity, source order and style source. For example, when two rules conflict, selectors with higher specificity take precedence; if the specificity is the same, the subsequent rules win; in addition, the priority of user agent, user and author styles also work. !important can be forced to cover, but should be used with caution. Managing the CSS structure, naming specifications and debugging tools can effectively improve the control of cascade.
- CSS Tutorial . Web Front-end 259 2025-07-20 03:50:41
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- How to change the order of elements with CSS?
- To adjust the display order of web page elements without changing the HTML structure, it can be implemented using CSS. 1. Use the order attribute of flexbox, set display:flex for the parent container, and set different order values for child elements to control the order, such as .item1{order:2} and .item2{order:1}, which will make .item2 appear before .item1, but will not affect the DOM structure and keyboard navigation order. 2. Use grid layout positioning, specify the position of elements in the grid through grid-column and grid-row, which is suitable for fixed layout scenarios. 3. Adjustment through float or position, but it is easy to cause confusion in publishing, and the cost of responsive design and maintenance is high.
- CSS Tutorial . Web Front-end 134 2025-07-20 03:47:31
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- How to use CSS filter to change image colors?
- To use CSSfilter to change the color of the picture, it can be achieved by combining common filter functions. 1.grayscale() can gray the picture, which is often used in the "disabled" state, such as grayscale(100%); 2.sepia() can add retro tones, such as sepia(80%), often paired with saturate() or contrast(); 3.hue-rotate() can change the main tone, such as hue-rotate(90deg), which is suitable for adjusting the overall color distribution; 4. Multiple filters can be used in combination, such as sepia(70%), contrast(110%), brightness(95%), to achieve more complex effects, multiple functions
- CSS Tutorial . Web Front-end 862 2025-07-20 03:47:10
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- Understanding collapsing margins in css
- Collapse Margins is the phenomenon that the vertical margins of two or more adjacent block-level elements in CSS are merged into one; for example, the margin under one div is 20px, and the margin on the other div is 30px, and the actual spacing is 30px instead of 50px; common situations include: 1. Between adjacent brother elements, such as when the upper and lower margins of the two divs are 20px and 30px respectively, it is merged into 30px; 2. If there is no border, padding, etc. between the parent element, the child element margin will "penetrate" the parent element; 3. The upper and lower margins of the empty block element are folded; avoiding methods are: 1. Add pa to the parent element
- CSS Tutorial . Web Front-end 917 2025-07-20 03:44:31
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- How to set a background image with CSS?
- TosetabackgroundimagewithCSS,firstusethebackground-imagepropertywiththecorrectURLinsideaCSSselectorforyourdesiredelement.Next,controlhowtheimagebehavesbysettingbackground-repeattono-repeat,background-positiontocenter,andbackground-sizetocoverforfull-
- CSS Tutorial . Web Front-end 754 2025-07-20 03:41:11
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- How to remove underline from a link in CSS
- To remove the default underscore of hyperlinks in web pages, 1. You can use the text-decoration property of CSS to none to remove globally; 2. You can also control specific links separately by adding class names or IDs; 3. If you need to remove underscores under different states (not accessed, accessed, hovered, clicked), you can set the corresponding pseudo-class or abbreviation merge respectively; 4. When removing underscores, you should pay attention to maintaining the user experience. It is recommended to provide visual prompts through color, background color, or font thickness to ensure accessibility.
- CSS Tutorial . Web Front-end 162 2025-07-20 03:40:11
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- How do Flexbox properties `justify-content` and `align-items` differ?
- justify-contentcontrolsalignmentalongthemainaxiswhilealign-itemsworksonthecrossaxis.1.justify-contentalignsitemshorizontallywhenflex-directionisrow,withvalueslikeflex-start,flex-end,center,space-between,andspace-around.2.align-itemshandlesverticalali
- CSS Tutorial . Web Front-end 703 2025-07-20 03:38:30
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- How to handle vendor prefixes in CSS?
- Automatic prefixes using Autoprefixer are the most recommended practices at present. It can automatically add necessary prefixes according to the target browser configuration, reduce redundant code and support mainstream construction tools; 2. Manual prefixes are suitable for debugging or experimental development. Common prefixes include -webkit-, -moz-, -ms-, -o-, but repeated codes are expensive to maintain, and are not recommended for long-term use; 3. Common attributes that require prefixes include Flexbox/Grid layout, animation transition, gradient background, filter transformation, user selection control, etc., which can be processed through CanIUse query compatibility or directly dependency tools.
- CSS Tutorial . Web Front-end 574 2025-07-20 03:26:21
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- How do CSS transitions work?
- CSS transitions achieve animation effects by smoothing interpolation property changes over a specified duration. 1. It monitors changes in specific CSS attributes, 2. It is only valid for animated attributes such as color, transparency, size, etc. 3. The common syntax is transition: propertydurationtiming-functiondelay, 4. Common triggering methods include hovering, class name change, focus status, etc. 5. Pay attention to avoid using all and carefully selecting animated attributes to optimize performance.
- CSS Tutorial . Web Front-end 438 2025-07-20 03:20:41
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- How to create a circular image with CSS?
- There are two main methods to create a circular picture using CSS: 1. Using border-radius: 50% is the easiest and common way, but make sure the picture is square, otherwise the ellipse will appear; 2. Using clip-path:circle (50%at50P%) can achieve more flexible circular cropping, suitable for creative effects or animations. In addition, it is recommended to wrap the image in a container, and enhance the control and visual effect by setting styles such as overflow:hidden, consistent width and height, object-fit:cover, etc., while paying attention to the clarity and adaptation of the image.
- CSS Tutorial . Web Front-end 862 2025-07-20 02:56:40
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- Explain how to debug CSS issues in browser developer tools
- The key to debugging CSS issues is to use browser developer tools (DevTools) for step-by-step troubleshooting. First, use the "Element Check" function to view the actual applied style of the target element and confirm whether there are overridden rules or final style values. Secondly, check whether the HTML structure is correct through the Elements panel, and use the box model panel to view margin/padding/border values to troubleshoot layout problems. Next, check, modify or add style rules in real time in the Styles panel to observe changes without affecting the source code. Finally, pay attention to common pitfalls, such as z-index stacking order, margin folding, element invisibility and responsive design problems, through DevTool
- CSS Tutorial . Web Front-end 965 2025-07-20 02:53:40
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- What is Flexbox in CSS
- A Flex container is a layout container created by setting display:flex or inline-flex. When setting display:flex, the container is a block-level element; when setting display:inline-flex, it is an inline element. Its child elements automatically become Flex projects, and can be laid out through flex-direction (define the spindle direction), justify-content (spindle alignment), align-items (cross axis alignment), flex-wrap (whether to line break), gap (project spacing) and other properties. In addition, align-self can adjust the alignment of an item individually. Flex
- CSS Tutorial . Web Front-end 908 2025-07-20 02:52:50
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- Describe the structure of a CSS rule set
- The CSS rule set consists of selectors and declaration blocks to define the style of HTML elements. 1. The selector specifies the target element, such as a tag, class, or ID; 2. Declare the block to contain attributes and values to control the appearance of the element. For example: p{color:blue;font-size:16px;} means selecting the paragraph and setting the text color and font size. Master these two parts to write effective CSS styles.
- CSS Tutorial . Web Front-end 673 2025-07-20 02:49:30
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