Add knowledge of list-style-type voice-over behavior

Author: josephrexme

css.md

@@ -1,2 +1,5 @@
 # CSS TILs
 - You can create a hamburger with `<a href="#" style="writing-mode:vertical-rl">|||</a>`
+- Using list-style-type none is bad for accessibility - [Fix][1]
+
+[1]: https://unfetteredthoughts.net/2017/09/26/voiceover-and-list-style-type-none/