As a content creator and editor, you are responsible for making sure the content you provide meets accessibility standards.
For tips on making your content accessible check out Accessible Content Tips.
A simple way you can check the accessibility on your page is by using the "Web Accessibility Evaluation Tool" at https://wave.webaim.org/ and pasting your URL into the Web page address... field.
If you find yourself repeatedly checking accessibility, you may want to install the WAVE extension. It's available for both Chrome and Firefox browsers at https://wave.webaim.org/extension/.
For more comprehensive accessibility testing, you may want to consider using services from Level Access. You can learn more at: https://soap.stanford.edu/make-accessible.
Stanford University will make Stanford Websites and web‐based applications accessible to its students, faculty, staff and participants in the University’s programs and activities who have disabilities. All personnel who are involved in the procurement, preparation and maintenance of University Websites and web‐based applications should adopt this goal, with the assistance of campus resources dedicated to supporting web accessibility.