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  • 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
  • What is the box-shadow property and how do you use it?
    What is the box-shadow property and how do you use it?
    The box-shadow property of CSS is used to add shadow effects around elements. Its core usage includes: 1. Define horizontal offset, vertical offset, blur radius, extension radius, color and inset keywords; 2. Add multiple shadows with commas separated; 3. Dropshadows is used to make elements look out of the page, while insetshadows is used for internal shadows; 4. Use reasonably to avoid affecting performance. For example, box-shadow:5px5px10pxrgba(0,0,0,0.3) creates a shadow that is in the lower right corner and translucent.
    CSS Tutorial . Web Front-end 183 2025-06-30 00:50:41
  • How to style the first letter or first line of a text block?
    How to style the first letter or first line of a text block?
    In web design, using CSS pseudo-elements can achieve the style beautification of the first letter or first line of the text block. 1. Use ::first-letter to add styles to the first letter of the paragraph, such as getting bigger, discolored, floating, etc., which are often used for the "capsular letter sinking" effect; 2. Use ::first-line to set indentation, color, background and other styles for the first line of the paragraph; 3. When applying, it is necessary to note that both are only suitable for block-level elements, and reasonably set attributes such as margin and float to avoid typography confusion; 4. In actual development, it is often used for content display scenarios such as article text, blog summary, etc., and combined with font services and responsive design can improve visual hierarchy and readability.
    CSS Tutorial . Web Front-end 319 2025-06-30 00:50:02
  • What is the difference between :nth-child and :nth-of-type in CSS Selectors?
    What is the difference between :nth-child and :nth-of-type in CSS Selectors?
    :nth-child first checks the position of the element in all child elements, and then determines whether it is the specified type; :nth-of-type first filters out the same type elements and selects them in order. 1.:nth-child(n) is used when selecting by position and determining that the position is the target label; 2.:nth-of-type(n) is suitable for selecting specific elements in type order in mixed content. Both support formulas and keywords such as even and odd, but the core difference is that the counting objects are different: the former is based on all child elements, while the latter is only for elements of the same type.
    CSS Tutorial . Web Front-end 848 2025-06-30 00:45:00
  • A practical CSS tutorial on View Transitions API
    A practical CSS tutorial on View Transitions API
    TheViewTransitionsAPIenablessmoothpagetransitionsusingminimalJavaScriptandCSS.1.Itworksbycapturingsnapshotsoftheoldandnewviews,thenanimatingbetweenthemwhenDOMchangesarewrappedindocument.startViewTransition().2.Youcanstyletransitionsusingpseudo-elemen
    CSS Tutorial . Web Front-end 535 2025-06-30 00:43:11
  • What is the general sibling combinator (~)?
    What is the general sibling combinator (~)?
    The universal sibling selector (~) in CSS is used to select all sibling elements after the specified element as long as they share the same parent element. ① It is not necessarily a sibling element that follows, but all subsequent sibling elements that meet the conditions; ② must be sibling nodes under the same parent element; ③ can match multiple elements; for example, using h2~p will select all elements that are after h2 and at the same level. Common uses include: ① Set styles for paragraphs after the title; ② Apply styles to elements after specific list items; ③ Highlight the content after the required labels in the form. But it does not select sibling nodes before the target element, elements nested within other tags, or elements under different parent nodes. Therefore, in the case where the structure later includes inner and outer, h2~p only
    CSS Tutorial . Web Front-end 303 2025-06-30 00:39:30
  • CSS tutorial for creating a card layout
    CSS tutorial for creating a card layout
    To achieve a good-looking and practical card layout, you can follow the following steps: 1. Use Flexbox to quickly build a responsive container, set display:flex, flex-wrap:wrap and gap to control arrangement and spacing; 2. Beautify the card style by setting max-width, box-shadow, padding and other attributes; 3. Use CSSGrid to achieve more complex typesetting, such as automatic filling of columns and responsive column width; 4. Pay attention to responsive common problems such as image size, text line breaks, and spacing consistency. These methods can effectively improve the aesthetics and adaptability of the layout.
    CSS Tutorial . Web Front-end 438 2025-06-30 00:27:20

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