Closed captions which copy screen text - are they necessary?

Hi Lindsay, I would argue that the text on screen is acting as closed captions. Because the audio does not need to be hear at a particular time in sync with an event, the slide text is adequate and most likely a better experience as it can be read at the users own pace, much like an audio transcript.

Just make sure that your slide text can be accessed by screen readers.

I think closed captions are redundant in this instance as you are already providing a text equivalent of the audio track.

The only thing to look out for though is, can a user read the text content quicker than the audio track is played? Once they have finished reading, do they then have to wait for the audio track to complete in order for a Next button to be enabled, or for content to appear on the slide? This can create periods of silence for some users where they have finished reading the content on page, and are waiting for an event (that they are unaware of) to happen on the slide.