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- What is the difference between `id` and `class` selectors?
- The role of id and class in CSS is different, and the usage scenarios are also different. 1.id is a unique identifier, used for style design of a single unique element, such as #main-content; 2.class can be reused and is suitable for multiple elements to apply the same style, such as .button; 3.id's selector priority is higher than class, which will affect style overwrite; 4. id is used in HTML, class is used in class, 5. id is used in CSS, and class is used in class. 6. It is recommended to avoid excessive use of id for style design, because it is not easy to cover; 7.
- CSS Tutorial . Web Front-end 488 2025-07-24 03:56:50
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- How do you center an element horizontally and vertically with CSS?
- To center elements horizontally and vertically, the most common methods include using Flexbox, Grid and absolute positioning to match transform. 1. Use Flexbox: Set the container to flex layout, and set it to center through justify-content and align-items, which is suitable for modern browsers and is simple and efficient; 2. Use Grid: Use display:grid and place-items:center to achieve centering, which is concise and clear; 3. Absolute positioning and transform: suitable for old browsers, set it to 50% by left and top and use transform to move half of its width and height back to achieve centering. It is commonly used
- CSS Tutorial . Web Front-end 481 2025-07-24 03:55:01
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- How to change the font color in CSS?
- To change the text color in a web page, use the color attribute of CSS. This property controls the foreground color of the text and supports color name, hexadecimal value, RGB or HSL format, such as: p{color:red;} or h1{color:#00ff00;}, which can be applied to label selector, class or ID; commonly used methods include: 1. Color name (such as red); 2. Hexadecimal (such as #ff0000); 3. RGB (such as rgb(255,0,0)); 4. HSL (such as hsl(0,100%,50%)); If the color does not take effect during debugging, it may be overwritten by other rules, insufficient contrast or wrong format. It is recommended to use browser developer tools to check and debug in real time to ensure the effect
- CSS Tutorial . Web Front-end 275 2025-07-24 03:51:21
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- Explain techniques for image replacement using CSS
- ImagereplacementinCSSinvolveshidingrealtextanddisplayinganimageorstyledversioninstead,ensuringaccessibilityandSEObenefitswhileallowingvisualcustomization.1.Theclassicmethodusestext-indenttomovetextoff-screenwhileshowingabackgroundimage,requiringsetel
- CSS Tutorial . Web Front-end 261 2025-07-24 03:49:41
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- What are CSS Logical Properties and Values?
- CSSLogicalProperties and Values provides a layout based on writing mode, using inline, block, start, end and other logical directions to replace the traditional left, right, top, bottom. 1. It enables the style to automatically adapt to LTR, RTL and vertical layout without additional adjustments; 2. Common attributes include margin-inline-start, padding-block-end, inline-size and block-size; 3. Applicable to international websites, component library development and responsive design; 4. Be careful about compatibility when using it, and some browsers may need to fall
- CSS Tutorial . Web Front-end 823 2025-07-24 03:48:40
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- How to create a tooltip with pure CSS?
- The key to implementing tooltip with pure CSS is structure and hover control. 1. The HTML structure includes outer container and inner prompt box; 2. CSS sets positioning, hiding and transition effects; 3. Use the:hover status to trigger display; 4. Add arrows to optional pseudo-elements; 5. Adjust position, delay and responsive adaptation. Through these steps, you can achieve tooltip effects without JavaScript.
- CSS Tutorial . Web Front-end 282 2025-07-24 03:48:01
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- 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
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- 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 463 2025-07-24 03:27:31
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- 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 874 2025-07-24 03:18:10
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- 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 548 2025-07-24 03:04:21
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- 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 392 2025-07-24 03:03:01
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- Controlling CSS pointer events
- The pointer-events attribute is used to control whether an element responds to a mouse or touch interaction. When set to auto (default), the element can respond to events normally, and when set to none, the element does not receive any pointer events, such as .disable-click{pointer-events:none;} can disable buttons or link clicks; child elements will inherit this setting unless pointer-events:auto is set separately; common scenarios include disabling buttons during loading, allowing the overlay to not block underlying interactions, and achieving special visual effects; in addition to auto and none, there are also advanced options such as visiblePainted and visibleFill, which are mainly used for SV
- CSS Tutorial . Web Front-end 490 2025-07-24 02:44:40
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- Explain the `font-display` property
- Thefont-displaypropertyinCSScontrolshowcustomfontsbehavewhileloading,impactingtextvisibilityanduserexperience.ItpreventsissueslikeFOITorFOUTbydictatingwhetherfallbackfontsareusedandwhenthecustomfontswapsin.Thecommonvaluesincludeauto,block,swap,fallba
- CSS Tutorial . Web Front-end 775 2025-07-24 02:44:21
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- How to disable a button with CSS
- To make the button look like it is disabled, CSS can only achieve visual effects, and it needs to be combined with HTML or JS to truly disable the functionality. Common practices: 1. Use CSS to set background color, text color, border and mouse pointer style to simulate the disabled state; 2. Use HTML's disabled attribute to completely disable the button and trigger the browser's default style; 3. Use pointer-events:none to prevent mouse interaction but pay attention to compatibility and keyboard event issues; 4. Use JavaScript to dynamically judge and prevent event triggering to achieve flexible control. The choice depends on the specific requirements and project structure.
- CSS Tutorial . Web Front-end 410 2025-07-24 02:38:12
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