[css-grid] Add initial draft of CSS Grid Layout Test Plan
Fixed typo
New display values grid and inline-grid tests
Merge pull request #623 from Igalia/css-grid-test-plan

[css-grid] Add initial draft of CSS Grid Layout Test Plan
Remove tests for inline style of calc() expressions

Serialization for calc() isn't specified, and WebKit and Blink disagree
on the value here. We're not testing that calc() works, so it is
sufficient to test the computed style.
Merge pull request #634 from bemjb/sit

Remove tests for inline style of calc() expressions
Rewrite spec-example tests as testharness.js tests

Because of small differences in the way browser engines do math and
layout, it is very hard to come up with a reftest that renders the same
in all browsers. Switching to a testharness test with fuzziness allows
the tests to be much more robust.
Update radial gradient tests to use testharness

Layout methods differ slightly in their computations between
implementations, causing minor differences in the positioning due to
shapes. Use testharness instead of ref tests so that the tests can
account for these differences.
Merge pull request #637 from bemjb/gradient

Update radial gradient tests to use testharness
Remove forgotten prefix, add failure on timeout to address review
comments.
Merge pull request #635 from bemjb/spec

Rewrite spec-example tests as testharness.js tests
Add reference file for font size case

Modify 15 font size cases and add 1 reference file.
Fix tests following Gérard Talbot review comments
Fix wrong filename
Merge pull request #624 from cabanier/master

Fixed typo in text that describes expected color
Add reference file for color t32 and color t422 case

Modify 8 test cases and add 7 reference files.
Merge pull request #592 from chenxix/chenxix/csswg-test/color-t32-t422

Add reference file for color t32 and color t422 case
Add reference files for Color tests t423-/424-/425-/t44- case
Merge pull request #594 from chenxix/chenxix/csswg-test/color-t-t423-4424-425-t44

Add reference file for color t423/424/424  case
Remove style-attr-cascade-README file