Chrome Version: 63.0.3218.0 (Official Build) dev (64-bit)
OS: macOS 10.12.6

What steps will reproduce the problem?
(1) Go to https://google.github.io/tacotron/
(2) Triple-click one of the sentences corresponding to an audio file (e.g. “Generative adversarial network or variational auto-encoder.”)
(3) Copy the selected text and paste it somewhere.

What is the expected result?

Only the visually selected text is copied.

What happens instead?

The triple-click selection includes at least some of the shadow DOM markup for the <audio> element's controls, including the current position and length times. The complete selected text looks like this:

(start)
“Generative adversarial network or variational auto-encoder.”

0:00
/ 0:05



(end)


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