Add tests for the marquee element
Update to resolve issues

1. Remove timeout
2. Modifie the asserts in the events tests
3. Correct the description in the loop test
4. Call the stop method in the start method test
5. Add a test to check the marquee's behavior is not alternate, etc.

Signed-off-by: xiaojunwu <xiaojunx.a.wu@intel.com>
Update the invalid nesting of the h2 elements
Resolve the typo issue
Add suffix for the filenames of manual tests
Merge pull request #455 from xiaojunwu/submission/xiaojunwu/the-marquee-element

Add tests for the marquee element