Can all users access content and navigate your site effectively?
These checks highlight opportunities to improve the accessibility of your web app. Only a subset of accessibility issues can be automatically detected so manual testing is also encouraged.
However with Accessibility the vast majority of items must be checked manual such as contract, usability and design.
This is also Important on to check the usability and design on differnet resolutions such as mobile, tabel and desktop.
This can be quickly done by entering the developer console and clicking the mobile view button located on the top left corner
of the developer console.
Here the screen will have a bar at the top of the screen allowing you to view the website at differenent resolutions.