How to Style CSS Elements with Colons in Their IDs?

CSS Selectors: Overcoming Colons in Element IDs

When working with CSS, you may encounter situations where you need to style an element with an ID containing a colon character (:). However, since the colon is used as a pseudo-element delimiter in CSS, it can lead to conflicts.

In your case, JSF has set the ID of an input field to "search_form:expression". To specify styling for this element, you're facing an issue with the colon causing the selector to be interpreted incorrectly.

Solution: Using Backslash Escape

To escape the colon and ensure that it's treated as part of the element ID, you can use a backslash () before it. For instance:

input#search_form\:expression {
  ///...
}

By adding the backslash, you effectively escape the colon, preventing it from being recognized as a pseudo-element delimiter. The browser will then interpret it correctly as part of the element ID.

Additional Resource:

• [Using Namespaces with CSS](https://msdn.microsoft.com/en-us/library/ms531194.aspx) (MSDN) provides further insights on this topic.

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