HTML5 Feature Detection: Presence vs Behaviour: Revision history

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12 July 2026

  • curprev 20:0620:06, 12 July 2026 Dex talk contribs 7,083 bytes +7,083 Created page with "Most HTML5 feature detection articles get it wrong. The classic approach was: <syntaxhighlight lang="javascript"> if(document.createElement("canvas").getContext) { // Canvas supported } </syntaxhighlight> Or even worse: <syntaxhighlight lang="javascript"> if(window.localStorage) { // LocalStorage supported } </syntaxhighlight> The problem is that these tests only prove that an API exists. They do '''not''' prove that it is functional. A browser may: * Expo..."
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