The whole post is worth a read, and gives before and after examples.
Consider also the following:
I was intrigued to note that the Dropbox post does not render properly in Internet Explorer 10. For some reason that must appeal to geeky humour, it includes code spoken as audio, but the audio tags fail:
Possible reasons: the Dropbox page has a DOCTYPE of XHTML 1.0, and the files are in .wav format where IE is documented only to support MP3 or MP4. IE10 therefore refuses to play the audio, which works fine in Google Chrome and Mozilla Firefox.
The significance of this is not so much the technicalities, but rather what it implies about how many people now use IE in the community most likely to read this post.