<!DOCTYPE qhelp PUBLIC

"-//Semmle//qhelp//EN"

"qhelp.dtd">

<qhelp>

<overview>

<p>

According to the HTML5 standard, the value of the <code>id</code> attribute of an element must

contain at least one character, and must not contain any space characters. ID attributes that

do not conform to this restriction may be interpreted differently by different browsers, and may indicate

a misunderstanding on the part of the developer.

</p>

</overview>

<recommendation>

<p>

Inspect the ID attribute in question. If its value is empty, the attribute is most likely useless

and can be removed. If it contains a space, perhaps the attribute was meant to be a <code>class</code>

attribute.

</p>

</recommendation>

<example>

<p>

The following HTML element has an ID attribute with a space in it:

</p>

<sample src="examples/MalformedIdAttribute.html"/>

<p>

Most likely this was meant to be a <code>class</code> attribute, like this:

</p>

<sample src="examples/MalformedIdAttributeGood.html"/>

</example>

<references>

<li>HTML5 Standard: <a href="https://www.w3.org/TR/html5/dom.html#the-id-attribute">3.2.5.1 The id attribute</a>.</li>

</references>

</qhelp>