diagnostic · one of 29free, no counter
Preferences
Does this page answer the preferences my browser is asking for?
Reduced motion, forced colours, high contrast, reduced data and colour scheme are all things a person has set in their operating system, and a page either has rules for them or does not. This puts what your browser is asking beside what the page answers, and the one actionable row is a query that was asked for and never mentioned.
Reach itPress ⌘+K on any tab and type preferences.Ctrl+Kon Windows and Linux

TWO BUILDS9 browsers
Chromelisting in reviewFirefoxlisting in reviewBravelisting in reviewOperalisting in reviewEdgelisting in review4 moreChromium browsers: Arc, Vivaldi, Chromium, Opera GXthe Chrome buildin the panel · free, no counter
What this actually is
force dark, reduced motion, contrast and localeBefore shipping anything animated, on any site claiming an accessibility standard, and when a reader has reported that a setting they rely on is ignored.
Asked about this diagnostic
4 of themWhy does it not say whether the rules are good enough?
Because that needs a judgement about the design. It counts the rules and names the queries with none, which is the part that can be established by reading the page.
What does "unanswered" mean exactly?
Your browser is asking for something - reduced motion, say - and the page has no rules for that query at all. That is a page which will animate regardless, and it is the row worth acting on.
Why compare against the query’s own answer?
Because `prefers-color-scheme: light` reports `dark` on a dark machine. Comparing against a fixed list of neutral answers gets that backwards, which is a bug this reading had.
Can I test the other setting without changing my OS?
Yes - the page bar’s Preferences card forces each one on the live page, so a reduced-motion layout can be checked without leaving the browser.
TWO BUILDS9 browsers
Chromelisting in reviewFirefoxlisting in reviewBravelisting in reviewOperalisting in reviewEdgelisting in review4 moreChromium browsers: Arc, Vivaldi, Chromium, Opera GXthe Chrome build63 of these · no host permissions · three free audits