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Test Info:

<!DOCTYPE html>
<html class="reftest-wait">
<style type="text/css">
body {
font-family: serif;
padding: 2px;
span {
padding: 2px;
<script type="text/javascript">
function do_test() {
var elems = ["one","two","three","four","five","six","seven","eight","nine","ten"];
for (key in elems) {
var e = document.getElementById(elems[key]);
e.innerHTML = elems[key];
document.addEventListener("MozReftestInvalidate", do_test);
<!-- Test for modification of text with preformatted tabs, see
In the first line, the tabs remain at the same offsets but widths will change;
in the second line, their offsets will also change. -->
<div style="white-space: pre">
<span id="one">iii</span>&#9;<span id="two">iii</span>&#9;<span id="three">mmmmm</span>&#9;<span id="four">mmmm</span>&#9;<span id="five">mmmm</span>
<span id="six">x</span>&#9;<span id="seven">x</span>&#9;<span id="eight">x</span>&#9;<span id="nine">x</span>&#9;<span id="ten">x</span>