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Content does not restrict its view and operation to a single display orientation, such as portrait or landscape, unless a specific display orientation is essential (i.e., bank check). 

Placement of controls affects their ease of use.

Media player accessibility is essential for video content. Evaluate the accessibility and cross-device compatibility of the media player that comes with your video-distribution platform.

The  element is for data that one might find in a spreadsheet, consisting of rows and columns of cells. It's important to ensure that the editing process allows identifying row and column headers.

Adding structure to web content makes it more readable and comprehensible to everyone and especially to people with a visual or cognitive impairment that makes reading on-screen content difficult.

Headings are used to group and label sections of content, giving visual structure to the page and providing a means of navigation to screen reader users.

Link text needs to clearly and accurately convey the link's purpose.

The title of a web page is the page's accessible name. 

To be as helpful as possible, the title should briefly tell the user what the page is about and where they are within the site. 

Avoid referring to a button, menu, or other item in the page only by its position on the page; instead, use additional information that describes the content.

When you include a list in your page content, this relationship needs to be conveyed visually, and it also needs to be conveyed to people using screen readers.