[Webkit-unassigned] [Bug 93540] New: ES5: Non writable properties should not be overridable

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=93540

           Summary: ES5: Non writable properties should not be overridable
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: HTML DOM
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: arv at chromium.org
                CC: oliver at apple.com, barraclough at apple.com


var descr = Object.getOwnPropertyDescriptor(HTMLMediaElement.prototype, 'NETWORK_NO_SOURCE');
shouldBeFalse('descr.writable');
shouldBeFalse('descr.configurable');
var el = document.createElement('audio');
shouldBeTrue('el instanceof HTMLMediaElement');

// No override
shouldBeUndefined('Object.getOwnPropertyDescriptor(el, "NETWORK_NO_SOURCE")');

// No override
shouldBeUndefined('Object.getOwnPropertyDescriptor(el.__proto__, "NETWORK_NO_SOURCE")');

// Should be ignored since not writable on the prototype chain
el.NETWORK_NO_SOURCE = 42;
shouldBe('el.NETWORK_NO_SOURCE', '3');

The invalid test is media/network-no-source-const-shadow.html

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