Added a test for the iframe element sandbox attribute, allow-script
Add some cases for the embed element

Signed-off-by: xiaojunwu <xiaojunx.a.wu@intel.com>
Refine tests for the embed element

- Add _manual suffix to reftest filename
- Add a reference file embed_represent_nothing_ref.html
- Remove embed_pass_parameters.html and embed_type_unmatch.html
  as not good design
Update according to the new template

1. Update the code format
2. Update the reference specification

Signed-off-by: xiaojunwu <xiaojunx.a.wu@intel.com>
Add tests for document base URL

Base on section 2.5 URLs

Signed-off-by: xiaojunwu <xiaojunx.a.wu@intel.com>
Resolve issues according to review comments

1. Rename files
2. Change titles
3. Remove the tests duplicate with reflection

Signed-off-by: xiaojunwu <xiaojunx.a.wu@intel.com>
Removed incorrect test

As per the conclusion at https://bugs.webkit.org/show_bug.cgi?id=103479
this test was incorrect.
Obsolete tests

These tests excercice something that was removed from the spec.
Resolve issues

1. Remove the test() from the t.step()
2. Typo
3. Split the tests into 3 tests
4. Remove the baseURL test

Signed-off-by: xiaojunwu <xiaojunx.a.wu@intel.com>
Address @deniak's comments
Remove trailing whitespaces
Merge pull request #600 from KenjiBaheux/incorrect-test-for-always-stopped-events

Removed incorrect test
Merge pull request #601 from KenjiBaheux/remove-custom-pseudo-element-tests

Obsolete tests
Merge pull request #454 from xiaojunwu/xiaojunwu/the-embed-element

Add tests for the embed element
Add tests for the FileReader interface.
Merge pull request #563 from w3c/pr/291

FileAPI FileReader interface tests added; r=zcorpan
Merge pull request #472 from xiaojunwu/submission/xiaojunwu/document-base-url

Add tests for document base URL; r=denis
cc Drop xml:id instances from some test cases.
cc Bring old <figure> test case up to date.
cc Reduce invalid test case to just one error.