Previewing with accessibility alerts

How to preview accessibility alerts on a page

1. When working on a draft page, click Save Draft in the upper right prior to publishing.
2. To the right of the Save Draft button, click the laptop icon, which will give you the option to Preview in a new tab.

This Preview window will alert you to accessibility issues that are present on the page before you publish your page so that you have an opportunity to fix those errors. For instance, if you do not add alt text to all of your images, you will have alerts displayed to allow you to add alt text, mark as decorative or ignore it because you are still editing the content of the page. You will notice a window that will display Next Issue to help you view all of the issues and determine solutions to fix. Please make sure that all accessibility errors within your control have been resolved prior to publishing your page. 

Here is the full documentation on the Accessible Content plugin, which powers this feature