Web accessibility is the process of making sure that your website is accessible to everyone. Far too many people assume that accessibility means adding an alt description to an image and making sure that the colour contrast is ok. Perhaps they have even heard of something called WCAG or ARIA. Or maybe they have even used a browser based accessibility checker tool. Those are all important but they are only a small part to removing barriers.
The web was meant to be read, not squished.
This isn't the way to test a responsive design.