- Older iOS browsers could not use regex lookbehind, regex dotall, and document.getElementsByClassname. Reworked code to be more universal but less elegant.
- Removed btn.onclick after clicking the btn, so as not to cause re-fire of click action on browsers that were too stupid to recognize that the click is meant for the audio element.
- Reactivate the btn.onclick after playback ends and button refactors into "played" button.

Fixed typo