How Do I Escape Colons in CSS Selectors for Namespace-Qualified HTML IDs?

Escaping Colons in CSS Selectors for HTML Elements with Namespace-qualified IDs

When dealing with elements in HTML that have namespace-qualified IDs, the presence of a colon (:) can interfere with CSS selectors. Browsers may interpret it as the beginning of a pseudo-element, causing the selector to be invalid.

To address this, you can escape the colon using a backslash (). For example:

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

By escaping the colon, you prevent the browser from misinterpreting it and allow the selector to correctly target the element with the ID "search_form:expression".

Additional Resource:

• [Using Namespaces with CSS](https://docs.microsoft.com/en-us/previous-versions/windows/internet-explorer/ie-developer/compatibility/using-namespaces-with-css) (MSDN)

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