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Editorial Team
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Asked: 2026-05-15T10:19:33+00:00

When using the JSF Web application framework, ID of the elements inside a form

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When using the JSF Web application framework, ID of the elements inside a form can be automatically generated by the framework and when a component resides in a form that its ID is form1, the framework automatically generates an ID in the form of form1:foo for that element. While this can be turned off, I was wondering if it’s possible to define a CSS ID selector for elements that their ID is in the form of foo:bar.

Thanks in advance.

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1 Answer

  1. Editorial Team

    According to the W3c spec linked to in this answer, using colons in element IDs is plain wrong if used unescaped.

    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”.

    Is the JSF framework really outputting those IDs in the final rendered HTML?

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