SIA-R1Documents have a `<title>` element

Accessibility requirements

This rule tests conformance of the following accessibility requirements:

This rule checks that documents have a <title> element that isn't empty or consists solely of whitespace.

This rule applies to every document where the document element is an <html> element in the HTML namespace.

The document has at least one descendant that is an <title> element in the HTML namespace.
The first <title> element in the HTML namespace that is a descendant of the document has child text content that is neither empty nor only whitespace.

This rule makes no assumptions.

This rule has no known accessibility support concerns.

This document has a <title> element that has child text content that is neither empty nor only whitespace and therefore passes the rule:

<html>
    <head>
        <title>This is a title</title>
    </head>
    <body>
        This is some content
    </body>
</html>

This document has no <title> element and therefore fails the rule:

<html>
    <body>
        This is some content
    </body>
</html>

This document has a <title> element with child text content that is empty and therefore fails the rule:

<html>
    <head>
        <title></title>
    </head>
    <body>
        This is some content
    </body>
</html>

This document has a <title> element with child text content that is only whitespace and therefore fails the rule:

<html>
    <head>
        <title> </title>
    </head>
    <body>
        This is some content
    </body>
</html>

In this document the document element is an <svg> element, not an <html> element, and the document is therefore inapplicable:

<svg xmlns="http://www.w3.org/2000/svg">
  <title>This is a circle</title>
  <circle cx="150" cy="75" r="50" fill="green"></circle>
</svg>