Add tests for structured clone for workers
new test files from TestTWF
add a comment clarifying where  is defined
Updated the tests with the recommended changes
add test for setSelectionRange method
add test case title
Added basic set of HTML Imports test.
Moved metadata from JS to link element
add input-type-button test files from TestTWF
Get rid of bad self-closing tags.
Merged redundant assert sections to titles.
shadow-dom: Update a test that checks invariants across distribution.
add blob determing encoding
fix the link
remove unreferenced file Blob.js
[TTWF Shanghai] Added idlharness test for FileAPI
moved the dictionary
move the dictionary
remove reductant files
add draggable_attribute, dropzone_attribute and dragevent TCs