Having :

<p><span class="test">123</span></p>

in the document, these won't select it :

$('span[innerHTML="123"]')

but this would :

$('span[innerHTML=123]')

The documentation says it should be quoted.

The working case does not match the documentation.

Both of these work :

$('p > span').filter('[innerHTML="123"]')

$('p > span').filter('[innerHTML=123]')

But both of these don't :

$('p > span.test').filter('[innerHTML="123"]')

$('p > span.test').filter('[innerHTML=123]')

Latest line used to work in jquery 1.4.2.

If innerHTML used for attribute selector is unsupported, please clearly state it in the documentation.