CSS变量名称可以以数字开头吗? [英] Can a css variable name start with a number?
问题描述
我想知道定义以这样的数字开头的css变量是否有效,
:root {--1space:32px;}
这在Chrome上可以正常使用,但是
:root {--2222:红色;}身体 {背景:var(-2222);}
I want to know if it is valid to define a css variable that starts with a number like this,
:root { --1space: 32px; }
this works just fine with Chrome, however that code is not being validated by https://jigsaw.w3.org/css-validator/ also VSCode draws a red line under the variable name.
if css variable names are idents then it should be ok to start with a number by this diagram;
https://www.w3.org/TR/css-syntax-3/#ident-token-diagram
Yes it's valid. If we follow the definition in the speficiation:
A custom property is any property whose name starts with two dashes (U+002D HYPHEN-MINUS), like
--foo
. The<custom-property-name>
production corresponds to this: it’s defined as any valid identifier that starts with two dashes
And
identifier
A portion of the CSS source that has the same syntax as an
<ident-token>
. Also appears in<at-keyword-token>
,<function-token>
,<hash-token>
with the "id" type flag, and the unit of<dimension-token>
.
:root {
--2222:red;
}
body {
background:var(--2222);
}
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