Headings and order: Use heading elements to distinguish between titles and text and to indicate their hierarchy in a logical and sequential order.

Meaningful titles: Use section headings and meaningful titles for each topic to aid in navigation and understanding.

Bullet point lists: Use proper list elements and finish each item with the appropriate punctuation, e.g., comma, period, etc. 

Alt text: Provide a meaningful and complete description relevant to your teaching purpose in alt tag.

High-quality images: Provide images with good resolution and contrast. 

No text images: Avoid using images with just text and use normal text instead. Don't use scientific notation as an image; use MATHJAX or LaTeX instead.

Closed captions: Provide closed captions that synchronize with the spoken words and sounds.

Transcripts: Make transcripts of audio and video recordings readily available to improve searchability and readability.

No Autoplay: The player should allow the viewer to stop and play the content at their own pace with controls of the player accessible on the keyboard.

Descriptive and unique link text: Avoid using generic phrases such as "Click here" or "Download". 

Page title instead of URL: Use the name of the page or site as the link text, rather than the URL. Keep the language simple, clear, and consistent.

Links should look like links: Differentiate links from regular text by using appropriate styling such as underlining and contrasting colors.

Plain language: Use concise and consistent language, terminology, and page structure throughout the course.

Limit capitalization: Avoid using capital letters excessively, making it harder to read. Only use where appropriate, such as for acronyms or logos.

Color contrast: Ensure adequate contrast between text and background. Be cautious when using light shades, particularly grey and yellow.

Simple tables: Use one table per topic and one piece of data per cell. Avoid nested tables for easy navigation.

Headers on columns and rows: Define headers for each column and row, both technically and visually, to create a more organized and easier-to-read table. 

Tables are for data: Only use tables to organize data, not for styling or layout. Keep them simple. Do not use images or screenshots of tables.