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Editorial Team
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Asked: 2026-06-06T12:20:05+00:00

Possible Duplicate: What characters are valid in CSS class names? Don’t if this is

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Possible Duplicate:
What characters are valid in CSS class names?

Don’t if this is suppose to be like this, but when I specify a class: .3plans, it does not apply the styling. But when I change the class name to .plans, it recognizes the style. Why is that? Note that the .3plans class is unique and there is no other style like that in my sheet, so it cannot be a duplicate. Is this phenomenon a common CSS practice? (not to use numbers in styles)

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1 Answer

  1. Editorial Team

    If class & ID is start from number then is not recognized by css. But you can write like this .plans3 instead of .3plans.

    As per W3c

    In CSS, identifiers (including element names, classes, and IDs in
    selectors) can contain only the characters [a-z0-9] and ISO 10646
    characters U+00A1 and higher, plus the hyphen (-) and the underscore
    (_); they cannot start with a digit, 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”.

    Check this discussion for more Which characters are valid in CSS class names/selectors?

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