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- Describe the purpose of the `z-index` property
- The z-index attribute controls the display level of positioning elements (such as relative, absolute or fixed positioning) in the page by setting the stacking order of elements. The specific rules are as follows: 1. z-index only takes effect on elements that have non-static positioning; 2. The larger the value, the higher the level, but be careful to avoid the abuse of high numerical values to cause confusion; 3. The elements must be compared in the same stacking context to be effective. The z-index of the parent container will limit the maximum display level of the child elements; 4. Common problems include not setting the position attribute, the parent created an independent stacking context or third-party CSS coverage, which can be solved by checking and adjusting the value layer by layer through the browser developer tools.
- CSS Tutorial . Web Front-end 469 2025-07-18 01:55:30
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- Describe the CSS `perspective` property
- The perspective attribute provides perspective effects for the 3D transformation of child elements by setting the observation distance. 1. It acts on the parent element to uniformly control the 3D perspective of the child element; 2. Unlike transform:perspective(), the latter only affects the current element; 3. It needs to be used with transforms such as rotateX, rotateY or translateZ to take effect; 4. Common reasons for invalid settings include: not using 3D transformations, written on child elements, or truncated by overflow:hidden. The smaller the value, the stronger the perspective. If set to none, there will be no effect.
- CSS Tutorial . Web Front-end 935 2025-07-18 01:49:51
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- How to create a dropdown menu with CSS?
- The key to creating a drop-down menu is the use of HTML structure and CSS. First, build a structure with an unordered list, the main menu item is the top level, and the submenu is nested inside it, for example, using nested ones. Secondly, control the hiding and display of the submenu through CSS, set .submenu{display:none;position:absolute;}, and display it when hovering: .dropdown:hover.submenu{display:block;}. Finally, you can add style details such as background color, hover effect, border shadow, etc. to improve the beauty and user experience.
- CSS Tutorial . Web Front-end 667 2025-07-18 01:48:41
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- How to create a responsive navigation menu with CSS?
- The core of the responsive navigation menu is clear structure, media query and simple interaction. 1. Use Flexbox to layout the infrastructure, HTML includes logo, link list and hamburger buttons; 2. Arrange elements through flex in CSS and set default styles; 3. Add media queries to hide links and display hamburger buttons when the screen is less than 768px; 4. Use JavaScript to control the menu to expand and close; 5. Optionally add transition animations to improve the experience, pay attention to details such as z-index and click areas to optimize the user experience.
- CSS Tutorial . Web Front-end 861 2025-07-18 01:38:11
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- How to use calc() in CSS?
- CSS's calc() function allows dynamic calculations in style sheets to implement responsive design. 1. Support addition, subtraction, multiplication and division operations, and there must be spaces on both sides of the operator; 2. Different units such as px, %, etc. can be mixed; 3. Applicable to scenarios such as adaptive width plus fixed margins, dynamic font size and grid layout spacing calculation; 4. Common errors include operators without spaces, nested use of calc(), etc. Mastering its basic structure and application can improve layout efficiency.
- CSS Tutorial . Web Front-end 862 2025-07-18 01:37:20
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- Describe the usage of CSS counters
- CSS counter is a function in CSS for dynamically generating numbers. It is initialized by counter-reset, and the counter-increment controls incrementing. It uses counter() or counters() to insert numbers in conjunction with pseudo-elements. 1. Use counter-reset to define counters; 2. Use counter-increment to specify incrementing rules; 3. Display numbers through ::before or ::after pseudo-element combined with content attribute; 4. Multi-level numbers need to reset the next layer counter at each level and use counters() to splice the level; Common problems include incorrect reset, missing pseudo-elements, errors in scope and hidden elements still
- CSS Tutorial . Web Front-end 503 2025-07-18 01:32:50
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- What are the key properties for controlling an animation (animation-name, duration, iteration-count, etc.)?
- The key attributes of CSS animation include animation-name specifying the @keyframes name, animation-duration defines the single time duration, animation-iteration-count controls the number of playbacks, and in addition, you need to master the animation-timing-function to adjust the speed curve, animation-delay sets the delay, animation-direction determines the direction, animation-fill-mode defines the front and back styles, and finally all settings can be integrated through the animation abbreviation attributes.
- CSS Tutorial . Web Front-end 308 2025-07-18 01:12:11
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- How to create a 'glassmorphism' effect with CSS?
- To achieve the "glassmorphism" effect, the core is to use CSS's backdrop-filter to achieve background blur, and to simulate the visual style of fross glass with translucent background, borders and hierarchical layout. 1. Use backdrop-filter:blur(10px) to blur the content behind the elements. This is the key to achieving glass texture, but it needs to be paid attention to its impact on performance. It is recommended to be used in small areas; 2. Add background:rgba(255,255,255,0.1) and border:1pxsolidrgba(255,255,255,0.2) and other styles to create translucency and softness.
- CSS Tutorial . Web Front-end 305 2025-07-18 00:21:01
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- What I Took From the State of Dev 2025 Survey
- State of Devs 2025 survey results are out! Sunkanmi Fafowora highlights a few key results about diversity, health, and salaries.
- CSS Tutorial . Web Front-end 306 2025-07-17 09:16:24
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- How does CSS scroll-snap work for creating scrollable sections?
- CSSscroll-snap achieves scroll adsorption effect by setting the alignment of the scroll container and child elements. Use scroll-snap-type to define the container scrolling direction (y/x) and mandatory type (mandatory/proximity), and then use scroll-snap-align to set the child element alignment (start/center/end). It is necessary to ensure that the container has overflow scrolling and avoid margins between child elements. You can optionally add scroll-behavior to achieve smooth scrolling.
- CSS Tutorial . Web Front-end 556 2025-07-17 03:47:20
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- What are CSS selector combinators?
- CSS selector combiner symbolically connects multiple selectors to pinpoint HTML elements. 1. The descendant selector is represented by spaces, and all descendant elements that meet the conditions in a certain element are selected; 2. The child element selector is represented by >, and only the direct child elements of the specified parent element are selected; 3. The adjacent brother selector is represented by , and the same element immediately after another element is selected; 4. The general brother selector is represented by ~, and all the same element that meets the conditions after matching a certain element.
- CSS Tutorial . Web Front-end 127 2025-07-17 03:38:21
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- CSS pseudo-elements ::before and ::after explained
- Use the ::before and ::after pseudo-elements to insert decorative content before and after the element content. 1. The content attribute must be set, even if it is an empty string; 2. It is an inline element by default, which can be adjusted through display; 3. It is often combined with position:absolute to accurately position; 4. It is not suitable for self-closed tags such as; 5. The added content is not accessible; 6. It is recommended to use double colon syntax::before/::after to maintain modern standards consistency.
- CSS Tutorial . Web Front-end 779 2025-07-17 03:37:40
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- Describe the CSS `object-fit` property
- The object-fit attribute is used to control the alignment and scaling of pictures or videos in the container. Common values include: 1.fill (stretching fill), 2.contain (holding scale to display the full picture), 3.cover (keep scale to fill the container, possibly cropping), 4.none (showing the original size), 5.scale-down (take the smaller effect between none and contain); is often used to unify the image display effect, such as the avatar component is clipped circularly, the product picture is kept neatly with cover, and the album is used to display complete photos; when using it, you should pay attention to only taking effect for replaceable elements, the container must have clear size, compatibility issues, and cooperation with object-po
- CSS Tutorial . Web Front-end 452 2025-07-17 03:28:51
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- Explain CSS animations using `@keyframes`
- @keyframesinCSSdefinesanimationstepsbyspecifyingstylesatkeypoints.1.Itusespercentagesorfrom/totomarkstageslike0%,50%,100%.2.Animationsareappliedtoelementsviatheanimationproperty,includingname,duration,timing,delay,andmore.3.Tipsincludenaminganimation
- CSS Tutorial . Web Front-end 757 2025-07-17 03:24:41
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