Buttons for changing between light and dark css file is experimental css, and does not behave consistently across browsers. This is expected to to be properly implemented by all browsers when w3c's specs. are made official.
Resize without blurring css does not work on icons page in Google Chrome, Opera, Maxthon and Apple Safari.
Add bookmark cannot work in Chrome, Opera, Maxthon and Safari. This is not a bug.
Sometimes an extra empty bottom line are added to lyrics and covers tables in MIE.
Play function gives error: Code 0, Object expected, line 1, char 1 in play.php in MIE.