Refactored my test case for wasm fail on iOS 11.2.2+ to a single JS file that runs synchronously: https://github.com/brion/min-wasm-fail/blob/master/min-wasm-fail.js
Feel free to nick it to use in #emscripten projects that need to fall back to asm.js versions on iOS!
Or this version which I commented up and prettied as a cjs module to use in ogv.js :) https://github.com/brion/ogv.js/blob/master/src/js/WebAssemblyCheck.js
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