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this creates a new page.
the scan feature has been around since CSS 2, and is in media queries 3, 4 and 5.
Note that no links to this page have been added to this PR. This PR is part of the much larger Media query module update project. Links to this scan page will be added in a separate PR. This page addition was made in a small PR in hopes of avoiding creating a huge PR. The links will be in the large PR to prevent merge conflicts.
BCD issue made: mdn/browser-compat-data#21990
Larger project: openwebdocs/project#192