I tried ace editor on Android chrome, and found that the cursor handles when selecting text did not show. Here is a screenshot from Galaxy S10 with Android 10, Chrome 81.0.4044.138:

https://ace.c9.io/build/kitchen-sink.html

Here is standard text widget from Google translate website, you can notice the cursor handle which I marked in black:

Without these two touch handles, it is hard to expand or reduce the selection scope on touch screen.