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test(() => {
const expected = [
"alpha",
"colorSpace",
"colorSpace toString",
"desynchronized",
"willReadFrequently",
];
var actual = [];
const options = {
get alpha() {
actual.push("alpha");
return true;
},
get willReadFrequently() {
actual.push("willReadFrequently");
return false;
},
get desynchronized() {
actual.push("desynchronized");
return false;
},
get colorSpace() {
actual.push("colorSpace");
return {
toString() {
actual.push("colorSpace toString");
return "srgb";
}
};
},
};
const canvas = new OffscreenCanvas(100, 50);
const context = canvas.getContext('2d', options);
assert_not_equals(context, null, "context");
assert_array_equals(actual, expected, "order of operations (creation)");
actual = [];
assert_equals(canvas.getContext('2d', options), context, "cached context");
// Getting the cached context does not involve the options argument at all;
// the context retains its existing settings, and the new options (if any)
// are ignored.
// Therefore, there is no expectation that the 'options' dictionary will be
// accessed again here, and we cannot predict the contents, if any, of the
// 'actual' array.
});
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