Magnifier is one of many accessibility features available out of the box in Windows 10. It makes part or all of your screen bigger so you can see words and images better. In Windows 10 20H1, it will get tighter integration with Narrator.
Windows 10 includes a magnifier feature which can be started with the Win + + designed for users with vision issues. Windows 10 Build 18947 comes with a new feature that allows utilizing Narrator to start reading text and controls from the mouse pointer click.
As of now, it is a work-in-progress, so it is not compatible with all Chromium-based browsers including Google Chrome and the new Microsoft Edge.
If you are running Build 18947, try it in action with the classic Microsoft Edge app.
The feature may reach the production branch with release of Windows 20H1 in 2020.
Thanks to Leo!