Created
September 2, 2020 16:52
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Detect system sleep and wake events in browser.
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| <html> | |
| <head> | |
| <title>sleep.js</title> | |
| </head> | |
| <body> | |
| <h1>sleep.js</h1> | |
| <script src="sleep.js"></script> | |
| <script> | |
| function logEvent(event) { | |
| const time = new Date(event.detail).toTimeString().substr(0, 8); | |
| console.log(event.type, time); | |
| }; | |
| document.addEventListener('sleep', logEvent); | |
| document.addEventListener('wake', logEvent); | |
| </script> | |
| </body> | |
| </html> |
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| (() => { | |
| const data = | |
| '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'; | |
| const video = document.createElement('video'); | |
| video.loop = true; | |
| video.muted = true; | |
| video.src = `data:video/mp4;base64,${data}`; | |
| video.play().then( | |
| () => { | |
| Object.entries({ | |
| pause: 'sleep', | |
| play: 'wake', | |
| }).forEach(([type, customType]) => { | |
| video.addEventListener(type, () => { | |
| document.dispatchEvent( | |
| new CustomEvent(customType, { detail: Date.now() }), | |
| ); | |
| }); | |
| }); | |
| console.info('System sleep/wake detection video initialized.'); | |
| }, | |
| () => { | |
| console.error('Unable to initialize system sleep/wake detection.'); | |
| }, | |
| ); | |
| })(); |
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This was a pretty crude experiment. I am noticing the same in Chrome 92.0.4515.131 as well. And it also happens when the window is open, but completely obscured by another window.
I assume that since the video renders only a single frame and is muted, the engine recognizes that it can change the playback state with no net effect to the user.
Perhaps if I included a second frame of video, it would not be able to do so…