Stop your Android screen from timing out. Use the in-browser wake lock, or adjust Screen timeout with the steps below.
Ready. Choose a duration and press Start.
Android turns the screen off after a set Screen timeout. You can lengthen it, or use a browser wake lock for a single session.
Many Android browsers support the Screen Wake Lock API, so the tool above often works directly.
Go to Settings → Display.
Pick a longer duration to delay sleep.
Or press Start above to keep the screen on in your browser.
Usually under Settings → Display → Screen timeout (names vary by brand).
Most modern Android browsers support it. If not, increase Screen timeout.
Developer options include 'Stay awake' while charging on many devices.