what is the use of second src in this code?

Question

<audio controls>
<source src="audio.mp3" type="audio/mpeg">
<source src="audio.ogg" type="audio/ogg">
Audio element not supported by your browser.
</audio>

it doesnt make any visual difference if- <source src="audio.ogg" type="audio/ogg">- is commented.

Answer 1

You have added same audio with two different extensions, in such cases first audio will play but when error occurs with first one then second audio will play.