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var setTextMeasure = function (contentElement, targetMeasure, maxSize, minSize) {
if (!contentElement) contentElement = document.createElement('p');
if (!targetMeasure) targetMeasure = 66;
if (!maxSize) maxSize = 16;
if (!minSize) minSize = 9;
var sizer = contentElement.cloneNode();
sizer.style.cssText = 'margin: 0; padding: 0; color: transparent; background-color: transparent; position: absolute;';
var letters = 'aaaaaaaabbcccddddeeeeeeeeeeeeeffgghhhhhhiiiiiiijkllllmmnnnnnnnooooooooppqrrrrrrsssssstttttttttuuuvwxyyz';
sizer.textContent = letters;
document.body.appendChild(sizer);
var characterWidth = sizer.offsetWidth / letters.length;
document.body.removeChild(sizer);
var contentWidth = contentElement.offsetWidth;
var measuredFontSize = parseFloat(
document.defaultView.
getComputedStyle(document.body, null).
getPropertyValue('font-size').
replace('px', '') );
var actualMeasure = contentWidth / characterWidth;
var newMeasure = measuredFontSize * actualMeasure / targetMeasure;
if (newMeasure > maxSize) newMeasure = maxSize;
if (newMeasure < minSize) newMeasure = minSize;
document.body.style.fontSize = newMeasure + "px";
}
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