| Testing the MuteButton class. |
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| On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE". |
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| PASS muteButton.element.localName is "button" |
| PASS muteButton.element.classList.contains("mute") is true |
| PASS muteButton.iconName is Icons.Volume |
| PASS muteButton.muted is false |
| PASS mutedButton.muted is true |
| PASS mutedButton.iconName became Icons.VolumeMuted |
| PASS muteButton.image.element.style.webkitMaskImage.includes("macOS/VolumeHi.svg") became true |
| PASS mutedButton.image.element.style.webkitMaskImage.includes("macOS/Mute.svg") became true |
| PASS successfullyParsed is true |
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| TEST COMPLETE |
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