Window.open vs <a target="">

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I am developing a browser, it will have support for tabs.

But I have a difficulty, "QWebPage::createWindow" does not differentiate "window.open" to "<a href="" targert="">".

eg.:

@var params = "menubar=no,location=no,resizable=no";
window.open("http://www.cnn.com/", "_blank", params);@

and

@<a href="http://www.cnn.com/" target="_blank">@

are considered the same by @QWebPage::createWindow@

How to differentiate both?

When window.open I will create a window and when anchors will add a new tab.

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