"New collective" <button> element inside <ul>

[viktorix]

Describe the bug "New collective" <button> element is inside <ul>, which it shouldn't be as HTM5 spec doesn't allow it:

Permitted content: Zero or more <li>, <script> and <template> elements.

To Reproduce Steps to reproduce the behavior:

1. Check "New button" HTML markup.

Expected behavior Either wrap <button> in <li> or move it outside <ul>.

Screenshots