The HTMLMediaElement.src property reflects the value of the HTML media element's src attribute, which indicates the URL of a media resource to use in the element.

API HTML DOM HTMLMediaElement Property Reference src

The HTMLTrackElement.src property reflects the value of the <track> element's src attribute, which indicates the URL of the text track's data.

HTML HTML DOM HTMLTrackElement Property Reference src Web WebVTT

API Experimental Property recognition Reference speech SpeechGrammar src Web Speech API