What are the methods for expressing width value in css?

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vw and vh units achieve responsive design by associating element sizes with viewport width and height; 1vw is equal to 1% of viewport width, and 1vh is equal to 1% of viewport height; commonly used in full screen area, responsive fonts and elastic spacing; 1. Use 100vh or better 100dvh in the full screen area to avoid the influence of the mobile browser address bar; 2. Responsive fonts can be limited with 5vw and combined with clamp (1.5rem, 3vw, 3rem) to limit the minimum and maximum size; 3. Elastic spacing such as width:80vw, margin:5vhauto, padding:2vh3vw, can make the layout adaptable; pay attention to mobile device compatibility, accessibility and fixed width content conflicts, and it is recommended to give priority to using dvh first;

Use a div with border to quickly create vertical lines, and define styles and heights by setting border-left and height; 2. Use ::before or ::after pseudo-elements to add vertical lines without additional HTML tags, suitable for decorative separation; 3. In Flexbox layout, by setting the width and background color of the divider class, adaptive vertical dividers between elastic containers can be achieved; 4. In CSSGrid, insert vertical lines as independent columns (such as autowidth columns) into grid layout, which is suitable for responsive design; the most appropriate method should be selected according to the specific layout needs to ensure that the structure is simple and easy to maintain.

TheCSSfilterpropertyallowsvisualeffectslikeblur,brightness,andgrayscaletobeapplieddirectlytoHTMLelements.1)Usethesyntaxfilter:filter-function(value)toapplyeffects.2)Combinemultiplefilterswithspaceseparation,e.g.,blur(2px)brightness(70%).3)Commonfunct

When using CSS selectors, low-specific selectors should be used first to avoid excessive limitations; 1. Understand the specificity level and use them reasonably in the order of type, class, and ID; 2. Use multi-purpose class names to improve reusability and maintainability; 3. Use attributes and pseudo-class selectors to avoid performance problems; 4. Keep the selector short and clear scope; 5. Use BEM and other naming specifications to improve structural clarity; 6. Avoid the abuse of tag selectors and:nth-child, and give priority to the use of tool classes or modular CSS to ensure that the style is controllable for a long time.

The mix-blend-mode attribute is used to control the mixing effect of element content and background. 1. Multiply can achieve the overlapping of text and background images; 2. Screen brightens the image and is suitable for dark backgrounds; 3. Overlay enhances contrast, combining multiply and screen features; 4. Difference creates a strong contrast, which is suitable for creative design; it is necessary to ensure that elements overlap and the correct z-index stacking order, and combined with isolation:isolate, the mixing range can be limited, and rich visual effects can be achieved by adjusting colors and modes.

To change the CSS list style, first use list-style-type to change the bullet or numbering style. 1. Use list-style-type to set the bullet of ul to disc, circle or square, and the number of ol is decimal, lower-alpha, upper-alpha, lower-roman or upper-roman. 2. Remove the tag completely with list-style:none. 3. Use list-style-image:url('bullet.png') to replace it with a custom image. 4. Use list-style-position:in

Usewhite-space:nowraptopreventtextfrombreakingontomultiplelines,ensuringcontentstaysonasingleline;2.Applythispropertytoinline,inline-block,orflexitems,whereflex-wrap:nowrappreventsitemwrappingandwhite-space:nowrappreventsinternaltextwrapping;3.Forspe