Device & browser capabilities
Technical guides about device & browser capabilities, written for practical follow-up.
Guides in this topic
5 articlesCSS pixels, zoom and the mobile keyboard: a viewport field guide
Find layout failures by comparing screen dimensions, layout viewport, visual viewport and device pixel ratio.
Feature detection that survives browser updates
Use existence checks, secure-context checks and a real operation to decide whether an API is usable in the current page.
Browser storage: quotas, eviction and persistence
Plan offline data handling around estimated usage, origin boundaries, failed writes and the limits of persistence requests.
Why a supported video format still fails to play
Separate container support, codec profiles, decoding performance and network delivery when diagnosing media playback.
Locale and timezone bugs: test the values your page actually uses
Reproduce date, number and language errors using explicit locale settings and timezone-aware examples.
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5 guides