Props: danielbachhuber, whyisjake, peterwilson, xknown.
Brings r46893 to the 4.7 branch.
Update `wp_kses_bad_protocol()` to recognize `:` on uri attributes,
`wp_kses_bad_protocol()` makes sure to validate that uri attributes don’t contain invalid/or not allowed protocols. While this works fine in most cases, there’s a risk that by using the colon html5 named entity, one is able to bypass this function.
Brings r46895 to the 4.7 branch.
Props: xknown, nickdaugherty, peterwilsoncc.
git-svn-id: https://develop.svn.wordpress.org/branches/4.7@46916 602fd350-edb4-49c9-b593-d223f7449a82