#css# id & class 不能以数字开头
[id='1800number_box'] { /* does work */ } #1800number_box { /* doesn't work */ } /* Or, you can "escape" the number, which looks funky but works: */ #\31 800number_box { /* does work */ }
[class="10"] {color: red;}
html5可以支持以数字开头的id/class,但是css不支持:
In CSS, identifiers (including element names, classes, and IDs in selectors) can contain only the characters [a-zA-Z0-9] and ISO 10646 characters U+00A0 and higher, plus the hyphen (-) and the underscore (_); they cannot start with a digit, two hyphens, or a hyphen followed by a digit. Identifiers can also contain escaped characters and any ISO 10646 character as a numeric code (see next item). For instance, the identifier “B&W?” may be written as “B\&W\?” or “B\26 W\3F”.
W3C Specification
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