Update CSS tests

[Elchi3]

Some CSS test updates:

• The -webkit-mask-box-image properties are gone with Remove -webkit-mask-box-image aliases mdn/browser-compat-data#25155
• -webkit-user-modify was removed with Remove -webkit-user-modify mdn/browser-compat-data#24885
• -webkit-text-decoration-skip was removed with Remove -webkit-text-decoration-skip mdn/browser-compat-data#24884
• word-wrap is an alias to overflow-wrap, so it should be ignored https://developer.mozilla.org/en-US/docs/Web/CSS/overflow-wrap
• cursor: inherit should be a sub feature as we record inherit as a global value