• Be clear, concise when writing text and arrange the content on the page in a logical, easy-to-follow fashion. Less text is easier to read and comprehend, and will more likely be read.
• Use fonts, type sizes, consistently throughout a page/site and prefer using one or possibly two typefaces only. This makes the pages easier to read and to follow.
• Create pages that help users, not pages, in which FORM is more important than CONTENT. Avoid trying to impress users with your "creativity" and "knowledge" of fancy effects and gimmicks.
• Use graphics, sound and video files sparingly and only if these will provide information that enhances the content. Avoid adding animations and sounds if they do not add to the content. Whenever, in doubt, do not use it.
• If you use radio buttons or other FORM related selection devices, use them sparingly or only when needed. Small buttons (or target areas) to select are difficult for some people to click on.
• When offering a choice or any form of response-required element (e.g., button, link), make this obvious to any user.
• When working with color on a page (backgrounds, text, links, etc.) make sure to choose colors that truly contrast (in brightness) or that do not become hard to read when viewed. Printing the page out in black and white will show some problems, but other situations can only be judged by researching. View the color chart to see how colors appear on screen displays.
• Create device-independent pages. Remember that not all users are using a mouse, or a scroll wheel, etc. Allow the user to determine which device to use by making sure to not create codes that are device-dependent (i.e., "on click")
• Check your work using validators and also by performing several simple steps:
  • Print your finished page in Black and White (grayscale) to see how it might appear to someone with visual difficulties
  • Turn off the graphics on your browser and view the page as TEXT ONLY. You can see if the page can be "read" well or if it is confusing
  • View the page with the style sheet setting turned OFF
  • Change the text size on your browser to see how the page looks
  • Try to navigate your page using the TAB key to move about the page. How well does it move through the document?
  • Try turning on text-to-speech and listen to how your page is spoken

Have people test your page, especially those who might have difficulties with access

https://uxdesign.cc/accessibility-drives-aesthetics-5aef77b5d2aa