264683 2023-11-11 12:29:53 -0800 "context lost" when getting WebGL context 2023-11-11 14:31:53 -0800 1 1 1 Unclassified WebKit WebGL Safari 17 iPhone / iPad iOS 17 RESOLVED DUPLICATE 264684 P2 Blocker --- 1 andrejohn.mas webkit-unassigned ahmad.saleem792 dino kbr kkinnunen oldest_to_newest 1991878 0 andrejohn.mas 2023-11-11 12:29:53 -0800 We are no longer able to get the WebGL context on iOS or iPadOS using release 17, with a "context lost" error being logged. The issues was discovered using Three.JS, but further investigation reveals this impacts all WebGL applications (those I have tested with). The following code is enough to cause the issue: ``` function initWebGL () { const canvas = document.querySelector('#canvas'); canvas.width = window.innerWidth; canvas.height = window.innerHeight; const glOptions = { // antialias: false, // alpha: false, // premultipliedAlpha: false }; const gl = canvas.getContext('webgl2', glOptions) || canvas.getContext('webgl', glOptions) || canvas.getContext('experimental-webgl', glOptions); } initWebGL(); ``` Note, this does not impact Safari (17.0 (19616.1.27.211.1)) on MacOS X 14. Tested with: iOS 17.0.3, iPadOS 17.0.3 and MacOSX 14 (Safari). Note, discussion in the Three.JS forum: https://discourse.threejs.org/t/three-js-broken-on-ios-17-with-context-lost/58025 1991906 1 ahmad.saleem792 2023-11-11 14:31:53 -0800 *** This bug has been marked as a duplicate of bug 264684 ***