Bug 202402
| Summary: | [GTK] 'instanceof' fails to identify objects properly inside an iframe | ||
|---|---|---|---|
| Product: | WebKit | Reporter: | Milan Crha <mcrha> |
| Component: | JavaScriptCore | Assignee: | Nobody <webkit-unassigned> |
| Status: | NEW | ||
| Severity: | Normal | ||
| Priority: | P2 | ||
| Version: | Other | ||
| Hardware: | Unspecified | ||
| OS: | Unspecified | ||
Milan Crha
Using WebKitGTK+ 2.26.0, aka webkit-2.26 branch at r249660. Using 'instanceof' operator in JSC fails to properly identify objects, returning 'false' even for cases which are should return 'true', including console output.
Steps to reproduce:
a) open a Console tab in an inspector and issue this set of commands:
document.documentElement.innerHTML = "<html><body>main<iframe id='frm1' src='empty:///'></iframe></body></html>";
document.getElementById("frm1").contentDocument.documentElement.innerHTML = "<html><body>frm1<iframe id='frm2' src='empty:///'></iframe></body></html>";
document.getElementById("frm1").contentDocument.getElementById("frm2").contentDocument.documentElement.innerHTML = "<html><body>frm1<iframe id='frm2' src='empty:///'></iframe></body></html>";
function checkit(elem) { if (elem) console.log("elem:" + elem + " tag:" + elem.tagName + " id:" + elem.id + " is iframe:" + (elem instanceof HTMLIFrameElement) + " is HTMLElem:" + (elem instanceof HTMLElement)); else console.log("elem is null");}
b) try what checkit() returns for respective elements. The "quoted" string is what it writes in the console.
checkit(document.documentElement);
> elem:[object HTMLHtmlElement] tag:HTML id: is iframe:false is HTMLElem:true
checkit(document.getElementById("frm1"));
> elem:[object HTMLIFrameElement] tag:IFRAME id:frm1 is iframe:true is HTMLElem:true
checkit(document.getElementById("frm1").contentDocument.getElementById("frm2"));
> elem:[object HTMLIFrameElement] tag:IFRAME id:frm2 is iframe:false is HTMLElem:false
I expect to see 'true' / 'true' at the end of the log above.
checkit(document.getElementById("frm1").contentDocument.getElementById("frm2").contentDocument.getElementById("frm2"));
> elem:[object HTMLIFrameElement] tag:IFRAME id:frm2 is iframe:false is HTMLElem:false
Similarly here and below, where it tried the HTML document of the inner iframe-s, which should work the same as the first checkit() call above, I believe.
checkit(document.getElementById("frm1").contentDocument.getElementById("frm2").contentDocument);
> elem:[object HTMLDocument] tag:undefined id:undefined is iframe:false is HTMLElem:false
checkit(document.getElementById("frm1").contentDocument);
> elem:[object HTMLDocument] tag:undefined id:undefined is iframe:false is HTMLElem:false
checkit(document.getElementById("frm1"));
> elem:[object HTMLIFrameElement] tag:IFRAME id:frm1 is iframe:true is HTMLElem:true
This just re-runs the working call from the above again.
I doubt I do anything wrong, but I'm new to Javascript, thus I'll be happy to be corrected.
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