During the Internet Explorer browser, the command will run two times

<div style="width:expression(alert('1'));"></div>

When this code is executed in IE7, it will trigger the alert function twice. Why does this happen?

Answer №1

Avoid using expressions. The expression parsing engine constantly recalculates them for even minor changes in context, such as mouse movements or shifts in element focus, causing excessive overhead. Moreover, there is inadequate documentation detailing when these recalculations occur, making it challenging to anticipate and plan for more intricate operations beyond simple calculations. Additionally, Microsoft has classified expressions as deprecated; thus, they may cease to function in future versions of Internet Explorer.

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