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This article mainly introduces the relevant knowledge of "css3 has no judgment sentence". The editor shows you the operation process through the actual case, the operation method is simple and fast, and it is practical. I hope this article "css3 has no judgment sentence" can help you solve the problem.

There is a judgment statement in css3, which is "@ supports (running condition) {css statement you want to implement}"; "@ supports" is one of the new rules introduced by css3, which is mainly used to determine whether the current browser supports a certain css attribute by conditions, and load a specific style, that is, css property detection.

The operating environment of this tutorial: windows10 system, CSS3&&HTML5 version, Dell G3 computer.

Does css3 have a judgment sentence?

There is a judgment statement in css3.

@ supports is one of the new rules introduced by CSS3, which is mainly used to detect whether the current browser supports a CSS attribute and load a specific style, that is, the property detection of css.

CSS feature detection is to determine whether the current browser supports a feature or not according to the conditions for different browser terminals. With CSS feature detection, we can use new technologies in browser environments that support current features, while those that do not support make some fallback mechanisms.

Let's take a look at how css3@supports is used and introduce the @ supports method for css feature detection.

The use of css3@supports

CSS@supports can implement feature detection through CSS syntax and write conditional judgment statements in the internal CSS block: the CSS statement that you want to implement if the feature test passes, and the CSS statement you want to implement if the feature test fails.

Basic syntax:

/ / if you pass the condition @ supports (running condition) {/ * apply the rule-css statement you want to implement * /} / / if you don't pass the condition @ supportsnot (running condition) {/ * apply the rule-css statement you want to implement * /}.

Let's look at a simple example:

@ supports (display:flex) {section {display:flex}...}

The above code means that if the browser supports the "display:flex" attribute, then use the "display:flex" style on the "section" element.

@ supports can also be combined according to different logical operators and have different syntax rules. Next, let's refine the syntax rules and usage details of @ supports.

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