getBoundingClientRect on a range
HTML
<div class="text">T</div>
<div class="result"></div>
CSS
div.text {
font-size: 64px;
line-height: 1em;
}
JavaScript
var div = document.querySelectorAll('div')[0];
var t = div.childNodes[0];
var range = document.createRange();
range.setStart(t, 0)
range.setEnd(t, 1)
console.log(range.getBoundingClientRect())