How to set DOM element as the first child?

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I have element E and I’m appending some elements to it. All of a sudden, I find out that the next element should be the first child of E. What’s the trick, how to do it? Method unshift doesn’t work because E is an object, not array.

Long way would be to iterate trough E’s children and to move’em key++, but I’m sure that there is a prettier way.

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var eElement; // some E DOM instance
var newFirstElement; //element which should be first in E

eElement.insertBefore(newFirstElement, eElement.firstChild);
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