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test(function() { performance.clearMarks(); const detail = { randomInfo: 123 } const markEntry = new PerformanceMark("A", { detail }); assert_equals(markEntry.detail.randomInfo, detail.randomInfo); assert_not_equals(markEntry.detail, detail); }, "The detail property in the mark constructor should be structured-clone."); test(function() { performance.clearMarks(); const detail = { randomInfo: 123 } const markEntry = performance.mark("A", { detail }); assert_not_equals(markEntry.detail, detail); }, "The detail property in the mark method should be structured-clone."); test(function() { performance.clearMarks(); const markEntry = performance.mark("A"); assert_equals(markEntry.detail, null); }, "When accessing detail from a mark entry and the detail is not provided, just return a null value."); test(function() { performance.clearMarks(); const detail = { unserializable: Symbol() }; assert_throws_dom("DataCloneError", ()=>{ new PerformanceMark("A", { detail }); }, "Trying to structured-serialize a Symbol."); }, "Mark: Throw an exception when the detail property cannot be structured-serialized."); test(function() { performance.clearMeasures(); const detail = { randomInfo: 123 } const measureEntry = performance.measure("A", { start: 0, detail }); assert_not_equals(measureEntry.detail, detail); }, "The detail property in the measure method should be structured-clone."); test(function() { performance.clearMeasures(); const detail = { randomInfo: 123 } const measureEntry = performance.measure("A", { start: 0, detail }); assert_equals(measureEntry.detail, measureEntry.detail); }, "The detail property in the measure method should be the same reference."); test(function() { performance.clearMeasures(); const measureEntry = performance.measure("A"); assert_equals(measureEntry.detail, null); }, "When accessing detail from a measure entry and the detail is not provided, just return a null value."); test(function() { performance.clearMeasures(); const detail = { unserializable: Symbol() }; assert_throws_dom("DataCloneError", ()=>{ performance.measure("A", { start: 0, detail }); }, "Trying to structured-serialize a Symbol."); }, "Measure: Throw an exception when the detail property cannot be structured-serialized."); test(function() { const bar = { 1: 2 }; const detail = { foo: 1, bar }; const mark = performance.mark("m", { detail }); detail.foo = 2; assert_equals(mark.detail.foo, 1); }, "The detail object is cloned when passed to mark API.");