In the fetch spec, the `text()` method of `Body` (an interface mixin
implemented by both `Request` and `Response`) consumes the body with
the Encoding spec "UTF-8 decode" algorithm, which skips the UTF-8 BOM
if it is present at the beginning of the body. Servo's implementation
does not do that. This patch fixes this.
Signed-off-by: Andreu Botella <abotella@igalia.com>
Most tests were only being run for layout-2013, not for layout-2020.
This wasn't great since layout-2020 is now the default.
So this patch unifies the lists of included tests for both layouts.
For layout-2013 this implies adding css/css-content/, css/css-logical/
and css/css-masking/clip/.
For layout-2020 this implies adding several additional css tests, and
also tests like dom/, js/, html/, etc.
