Verify style sharing does not ignore the "readonly" attribute.

Padding No readonly No readonly No readonly Padding

Padding Readonly defined Readonly defined Readonly defined Padding

Padding Readonly defined empty Readonly defined empty Readonly defined empty Padding

Padding Readonly is foobar Readonly is foobar Readonly is foobar Padding

Padding No readonly No readonly No readonly Padding Padding Readonly defined Readonly defined Readonly defined Padding Padding Readonly defined empty Readonly defined empty Readonly defined empty Padding Padding Readonly is foobar Readonly is foobar Readonly is foobar Padding