clamp() function realizes responsive font scaling through the minimum, preferred and maximum values; 2. The syntax is clamp (minimum value, preferred value, maximum value), and commonly used rem and vw units; 3. The font takes the minimum value on the small screen, and scales according to vw as the screen increases, and does not exceed the maximum value; 4. Reasonably select the numerical value to ensure readability and avoid being too large or too small; 5. Combining the rem type proportion to improve design consistency.

Use aspect-ratio:1/1 to create a responsive square, and set the aspect ratio in modern browsers; if you need to be compatible with old browsers, you can use padding-top:100% technique to maintain the consistency of width and height by relative units; you can also use vw units to make the square change with the viewport.

1. Open the web page printing interface, click "More Settings" and uncheck "Header and Footer" to remove automatically added URLs, dates and other information. 2. By adding the CSS style of @mediaprint{@page{margin:0}} to the web page code, the default margins and headers and footers can be cleared. 3. Install third-party printing extensions such as PrintEdit, which can edit print content more flexibly and disable the default header and footer.

Use backdrop-filter:blur() to achieve the frosted glass effect, combining rgba transparent background, thin borders and rounded corners, such as .frosted-card{backdrop-filter:blur(10px);background-color:rgba(255,255,255,0.1);border:1pxsolidrgba(255,255,255,0.2);border-radius:12px;padding:20px;}, be sure to ensure that there is content behind the elements and pay attention to browser compatibility.

Define CSS variables and combine prefers-color-scheme to implement dark mode. Set light-color themes through:root, overwrite them as dark colors in @media, use variables to uniformly apply styles, and optionally switch between JavaScript to add transition and contrast optimization experience.

Use the :last-child pseudo-class selector to accurately locate the last child element in the parent container, regardless of its type. For example, li:last-child is used for the last item on the list, and *:last-child is suitable for any ending element. Unlike :last-of-type, :last-child only focuses on whether it is the last child node, while :last-of-type matches the last instance of a particular type. This method is widely supported and is suitable for scenarios such as removing unnecessary margins or highlighting the last item.

Logicalpropertiesenableadaptable,internationallayoutsbyreplacingfixeddirectionswithflow-relativetermslikeblockandinline,ensuringconsistentstylingacrossLTR,RTL,andverticalwritingmodes.

The:emptypseudo-classselectselementswithnocontentorchildren,includingnospacesorlinebreaks;forexample,div:emptystylescompletelyemptydivs,andcombiningitwith::beforecaninsertfallbackmessageslike"Nocontentavailable"toimprovelayouthandlingindyna