javascript - span.style.textAlign not working -

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i've created function allows user align highlighted/selected text right/left/center, doesn't seem working.

function docenter() {     {         var selection = window.getselection().getrangeat(0);         var selectedtext = selection.extractcontents();         var span = document.createelement("span");         span.style.textalign = "center";         span.appendchild(selectedtext);         selection.insertnode(span);     } }

i've tried separate function same thing, except highlights words instead of aligning them, , works:

function highlighter() {     {         var selection = window.getselection().getrangeat(0);         var selectedtext = selection.extractcontents();         var span = document.createelement("span");         span.style.backgroundcolor = "yellow";         span.appendchild(selectedtext);         selection.insertnode(span);     } }

can tell me what's wrong first code?

span inline element whereas block elements may have child content aligned. either use div or p instead of span, or set

span.style.display = 'block';

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