How Do I Escape Colons in CSS Selectors When Using Namespaces?

Escaping Colons in CSS Selectors with Namespace Prefixes

In certain scenarios, such as when working with JavaServer Faces (JSF), elements may be assigned IDs containing colons (e.g., "search_form:expression"). However, colons are commonly used to initiate pseudo-element selectors in CSS, leading to invalid syntax when attempting to style such elements directly.

To overcome this issue, you can escape the colon using a backslash (). By placing a backslash immediately before the colon, the colon is interpreted as a literal character rather than the start of a pseudo-element.

Example:

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

This modified CSS selector will correctly target the element with the ID "search_form:expression" and allow you to apply the desired styling.

Additional Information:

• The use of colons in element IDs often occurs when utilizing namespaces in XML-based technologies.
• Refer to Microsoft's documentation on "Using Namespaces with CSS" for further insights.

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