Is there a "Reading mode"?

In Andoid 5, when doing nothing, after a few seconds (10 seconds?), the light dims, and after 30 seconds, the screen goes off. (This can be changed in *Settings > Display and wallpaper > Screen timeout*). This is generally good, but **when reading** something on internet, it's annoying, because the screen goes off all the time, forcing to tap the screen often to keep it on. **Question: is there an option, easily switchable on/off (for example in the top panel with Wi-Fi, Location, Mute, Screen rotation icons, etc.?) to prevent the screen timeout?** Note: I've seen a **"Smart stay"** feature ("screen stays on as long as you are looking at it") but this works by *"detecting your face with the front camera so that ..."*. For both battery and personal reasons, I don't want the camera to be constantly on (watching me ;)) while I'm reading, so I don't want to use "Smart stay" feature. Note: this [question](https://android.stackexchange.com/q/4595/58896) is linked, but it targets Android 2, and is rather old (7 years old), so things might have changed thanks to new Android versions.