The Range.getBoundingClientRect()
method returns a DOMRect
object that bounds the contents of the range; this is a rectangle enclosing the union of the bounding rectangles for all the elements in the range.
This method is useful for determining the viewport coordinates of the cursor or selection inside a text box. See Element.getBoundingClientRect()
for details on the returned value.
<div id="highlight"></div>
<p>This example positions a "highlight" rectangle behind the contents of a range. The range's content <b>starts here</b> and continues on until it <b>ends here</b>. The bounding client rectangle contains everything selected in the range.</p>
#highlight {
background: yellow;
position: absolute;
z-index: -1;
}
p {
width: 200px;
}
const range = document.createRange();
range.setStartBefore(document.getElementsByTagName('b').item(0), 0);
range.setEndAfter(document.getElementsByTagName('b').item(1), 0);
const clientRect = range.getBoundingClientRect();
const highlight = document.getElementById('highlight');
highlight.style.left = `${clientRect.x}px`;
highlight.style.top = `${clientRect.y}px`;
highlight.style.width = `${clientRect.width}px`;
highlight.style.height = `${clientRect.height}px`;