…ps. (servo#45471)
Previously, the indeterminate state of input elements was not propagated
when an element was cloned. However, this did not align with other web
browsers and the web platform tests.
This PR extends the input element specific cloning steps in order to
also copy the indeterminate attribute value to the cloned element.
This behavior is not explicitly required by the spec, however this
change better aligns servo with other implementations.
Testing: Updated the expectations of the corresponding web platform
test.
Signed-off-by: Glenn Skrzypczak <glenn.skrzypczak@gmail.com>