New answers tagged internet-explorer
The problem would seem to be that you are specifying an unsupported/invalid mime-type in the type attribute. (See IE audio object - Scroll down for the supported mime-types.) If this is AAC in an MP4 container then the correct mime-type should probably be audio/mp4. Internet Explorer does not appear to be able to handle an incorrect mime-type, whereas ...
Fixed, the following syntax does work: <audio src="music.m4a" controls></audio>
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