Update web-platform-tests and CSS tests.

- Update CSS tests to revision e05bfd5e30ed662c2f8a353577003f8eed230180.
- Update web-platform-tests to revision a052787dd5c069a340031011196b73affbd68cd9.

tests/wpt/css-tests/tools/pytest/doc/en/mark.rst

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+
+.. _mark:
+
+Marking test functions with attributes
+=================================================================
+
+.. currentmodule:: _pytest.mark
+
+By using the ``pytest.mark`` helper you can easily set
+metadata on your test functions. There are
+some builtin markers, for example:
+
+* :ref:`skipif <skipif>` - skip a test function if a certain condition is met
+* :ref:`xfail <xfail>` - produce an "expected failure" outcome if a certain
+  condition is met
+* :ref:`parametrize <parametrizemark>` to perform multiple calls
+  to the same test function.
+
+It's easy to create custom markers or to apply markers
+to whole test classes or modules. See :ref:`mark examples` for examples
+which also serve as documentation.
+
+.. note::
+
+    Marks can only be applied to tests, having no effect on
+    :ref:`fixtures <fixtures>`.
+
+
+API reference for mark related objects
+------------------------------------------------
+
+.. autoclass:: MarkGenerator
+    :members:
+
+.. autoclass:: MarkDecorator
+    :members:
+
+.. autoclass:: MarkInfo
+    :members:
+