英文:
What is the syntax for JavaScript’s CSS supports method?
问题
我正在测试新的:has()
伪类。到目前为止,只有Firefox没有默认启用它。
我在https://stackoverflow.com/questions/73936048/how-do-you-enable-has-selector-on-firefox的评论中看到了以下测试:
CSS.supports("selector(:has(:focus))");
当我在Firefox上启用设置时,它返回true
,否则返回false
,这是预期的结果。
问题是,selector(:has(:focus))
实际上是什么意思?显然,它正在测试:has()
伪类,但selector()
和(:focus)
部分是什么意思。如果我试图简化它,测试不起作用——至少返回false
。
我找不到关于CSS.supports()
方法的详细文档来讨论这个问题。
英文:
I am testing out the new :has()
pseudo class. So far, only Firefox hasn’t enabled it by default.
I read in a comment on https://stackoverflow.com/questions/73936048/how-do-you-enable-has-selector-on-firefox about the following test:
CSS.supports("selector(:has(:focus))"));
It returns true
when I’ve enabled the setting on Firefox, and false
otherwise, which is expected.
The thing is what does the selector(:has(:focus))
actually mean? Obviously it’s testing for the :has()
pseudoclass, but what’s with the selector()
and the (:focus)
parts. If I try to simplify it, the test doesn’t work — at least it returns a false
.
I can’t find any detailed document on the CSS.supports()
method which discusses it.
答案1
得分: 2
OK,我明白了。
selector()
测试语法:has(:focus)
是否可接受。has(:focus)
是一个虚拟测试。:has()
不会起作用,因为它不能有一个空值,所以必须是:has( something )
。评论者使用了:has(:focus)
,但也可以使用:has(p)
、:has(gorilla)
或:has(…)
。
所以,用英语来说,这个测试是检查CSS是否支持语法 :has(anything)
。
英文:
OK, I think I understand.
selector()
tests whether the syntax:has(:focus)
is acceptable.has(:focus)
is a dummy test.:has()
won’t work because you can’t have an empty value, so it has to be:has( something )
. The commenter use:has(:focus)
but could just as well have used:has(p)
or:has(gorilla)
or:has(…)
.
So, in English, the test is whether CSS supports the syntax :has(anything)
.
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