Rocket Validator automatically scans your sites for accessibility issues using the W3C Validator,
hosted on our own servers and integrated into our web crawler.
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HTML issues tagged as deprecated.
projection media type was deprecated in Media Queries 4.
Media types describe the general category of a device, for example
CSS 2.1 and Media Queries 3 defined several additional media types (
aural), but they were deprecated in Media Queries 4 and shouldn’t be used.
When was the last time you validated your whole site?
Keep your sites healthy checking for A11Y/HTML issues on an automated schedule.