There must only be one main landmark to navigate to the primary content of the page, even if the page contains iframes.
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It is a best practice to ensure that there is only one main landmark to navigate to the primary content of the page, and that if the page contains iframes, each should either contain no landmarks, or just a single landmark.
The Algorithm, in Simple Terms
Why this is Important
Navigating a web page is far simpler for screen reader users if all of the content is split between a number of high level sections. Content outside of these sections is difficult to find and its purpose may be unclear.
How to Fix the Problem
Ensure all content is contained within a landmark region, designated with HTML5 landmark elements and/or ARIA landmark regions.
- HTML 4