Google might update Chrome's "Listen to this page" feature on Android to work in the background. A browser flag spotted in Chrome for Android hints that the functionality is currently being developed.
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The office app on iOS is expected to get a feature update this month. One of the highlights could be the ability to listen to documents while the screen of your iOS device is locked.
Microsoft is detailing improvements to the 'Read Aloud' feature on Edge Dev and Canary branches. It includes leveraging cloud-powered text-to-speech voices powered by Microsoft Cognitive Services.