the browser-facing portion of osu!

Add test for invalid classname

clayton 7c8f7d41 7b496a55

+6
+1
tests/Libraries/Markdown/html_markdown_examples/style_block_invalid_class.html
··· 1 + <p class="osu-md__paragraph">paragraph</p>
+5
tests/Libraries/Markdown/html_markdown_examples/style_block_invalid_class.md
··· 1 + {{{ Invalid Class 2 + 3 + paragraph 4 + 5 + }}}