Tests for AnimationNode methods
improving tests according review comments
improving tests according to review notes
Changes according review notes. AnimationNodeList has no forEach()
Split out some assertions in the Node#cloneNode tests.
Only test Element members for Elements.
Add some additional tests.
Add a test for cloneNode with a prefix.
Update the help URL.
Add a test for Node#cloneNode on a non-HTML element.
Use assert_not_equals.
Give the Node#cloneNode tests names.
Add more tests to attr_is.
Add tests for getting HTMLOptionElement#{label,value}.
Update specification URLs in dom/.
Add a test for HTMLOptionElement#text on an element with a label attribute.
Remove createEvent.NOT_SUPPORTED_ERR.html.

This assertion is already covered by dom/nodes/Document-createEvent.html.
fixing tests by correcting imports

find element by id does not exist in the spec anymore, also correcting other removed locators

make element.text consistent (changing to property access)
Merge pull request #1337 from Ms2ger/option-text-label

Add a test for HTMLOptionElement#text on an element with a label attribute.
Merge pull request #1336 from Ms2ger/remove-dupe-d3e

Remove createEvent.NOT_SUPPORTED_ERR.html.