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javascript - Change font after createTextNode()

I need to change the font of element created by the createTextNode() function:

var s = document.createTextNode(item.text);
s.setAttribute("font size") = -1;
elem.appendChild(s);

In my code I get error on Firebug:

s.setAttribute is not a function

How can I change a font of created element?

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You don't specify font on text nodes, you do so on the parent element - in your case:

elem.style.fontSize = "20px";

If you don't wish to change the font size for the entire parent element, you can create a <span> element to wrap around the text node:

var span = document.createElement('span');
span.style.fontSize = "20px";
span.appendChild(s);
elem.appendChild(span);

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