Add tests for rel, rellist, download, and text on SVGAElement

[dstorey]

These are based on the equivalent tests in HTML's Anchor folder with minimal changes to put in SVG template and creating elements in the SVG namespace.

These tests are a precursor to moving these members to a mixin defined in HTML, and as such are expected to fail in current implementations.

[dstorey]

Note: we haven't moved click() into the HTMLOrSVGElement mixin yet, so this will fail even if download is supported. I wasn't sure how to force click the download link without this and didn't want to change too much from the original test. We've discussed adding click() to the mixin, which I think we probably should do (will be trivial to implement in Edge at least)

[ghost]

Build PASSED

Started: 2018-04-02 23:31:18
Finished: 2018-04-02 23:45:16

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[longsonr]

the first argument to test_rellist('A', link_support_table['a']); in rellist-feature-detection.svg should be 'a' and not 'A'

With that change Firefox with the patch in https://bugzilla.mozilla.org/show_bug.cgi?id=1451823 passes these tests apart from the download test which is noted as broken above.

See https://treeherder.mozilla.org/#/jobs?repo=try&revision=a1c1cfc763df659af3fbad8b832a4273e6cd0da0&selectedJob=172137761 for more details.

Note there is another wpt that needs changing: testing/web-platform/tests/dom/lists/DOMTokenList-coverage-for-attributes.html I have a fix in the patch in https://bugzilla.mozilla.org/show_bug.cgi?id=1451823 for that.

[dstorey]

@longsonr thanks for the spot, and the implementation. I've just updated it.

For the click() issue, are you interested in implementing that in Firefox? If so I'll open a PR to add it to Edge and we'll have the two implementations. I'll also update the HTML GitHub issue for HTMLorSVGElement to get click() added to that mixin.

Otherwise we'll need to find another way to test download attribute.

[longsonr]

While I could implement click() support provided it was added to the specification and there was agreement to implement, which it sounds as if there might be. Wouldn't it be better for now to just change the link.click() call to this:

link.dispatchEvent(new Event('click'));

That works in my patched Firefox build

https://treeherder.mozilla.org/#/jobs?repo=try&revision=8c90e8e53643dfbb5711b1c257c7b3682454df90

[longsonr]

My fix landed in Firefox. The WPT test change is in #10473

[svgeesus]

With changes suggested by @longsonr included, this lgtm