For Mac OS users, there is a system setting that may not allow you to tab onto several types of elements in a web page. To change this setting:
by Google Tips
Posted on September 21, 2016
Want to keep your notes and reminders on Google? Try Google Keep.
Just follow this link: keep.google.com
If you want, you can add the Chrome extension. There will be a note on your page that provides the link. That was you can get notifications from your reminders. I've attached two pictures: one shows the initial screen which includes the blue note telling you about the extension. The next show what your screen will look like after adding a note or reminder.