4.1.1 ID tests fail with "." in ID's

[AccessibilityNL]

Several tests will look for elements based on their ID, including:

• documentIDsMustBeUnique
• idRefHasCorrespondingId
• idrefsHasCorrespondingId

I'm not sure if any others do. What happens here is that the ID gets passed into a selector: $('#' + id);
This can fail when ID's contain values meaningful to CSS such as a period (.), such as an ID like id_0.123 We should make sure strings that are put into a selector are escaped.

[WilcoFiers]

Whoops, wrong account. This above was me :)

[jessebeach]

arg, good point :/

grumble grumble HTML ID spec...