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    1. 2.4 URLs
      1. 2.4.1 Terminology
      2. 2.4.2 CORS settings attributes
      3. 2.4.3 Referrer policy attributes
      4. 2.4.4 Nonce attributes
      5. 2.4.5 Lazy loading attributes
      6. 2.4.6 Blocking attributes
      7. 2.4.7 Fetch priority attributes

2.4 URLs

2.4.1 Terminology

A string is a valid non-empty URL if it is a valid URL string but it is not the empty string.

A string is a valid URL potentially surrounded by spaces if, after stripping leading and trailing ASCII whitespace from it, it is a valid URL string.

A string is a valid non-empty URL potentially surrounded by spaces if, after stripping leading and trailing ASCII whitespace from it, it is a valid non-empty URL.

This specification defines the URL about:legacy-compat as a reserved, though unresolvable, about: URL, for use in DOCTYPEs in HTML documents when needed for compatibility with XML tools. [ABOUT]

This specification defines the URL about:html-kind as a reserved, though unresolvable, about: URL, that is used as an identifier for kinds of media tracks. [ABOUT]

This specification defines the URL about:srcdoc as a reserved, though unresolvable, about: URL, that is used as the URL of iframe srcdoc documents. [ABOUT]

A URL matches about:blank if its scheme is "about", its path contains a single string "blank", its username and password are the empty string, and its host is null.

Such a URL's query and fragment can be non-null. For example, the URL record created by parsing "about:blank?foo#bar" matches about:blank.

A URL matches about:srcdoc if its scheme is "about", its path contains a single string "srcdoc", its query is null, its username and password are the empty string, and its host is null.

The reason that matches about:srcdoc ensures that the URL's query is null is because it is not possible to create an iframe srcdoc document whose URL has a non-null query, unlike Documents whose URL matches about:blank. In other words, the set of all URLs that match about:srcdoc only vary in their fragment.

2.4.2 CORS settings attributes

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