javascript - Get element offset relative to document without getBoundingClientRect (Webkit bug) -


positioning tooltip / popup case of using getboundingclientrect() or jquery's offset() function (which internally uses getboundingclientrect) offset relative document or window, if zoom in on webkit browsers, these functions start returning unexpected / wrong results because getboundingclientrect function implemented weirdly in webkit. has been issue forever , reason has never been fixed.

question: how can (if possible) calculate exact pixel offset of element relative document without using getboundingclientrect() values don't change on zoom?

i able solve in https://jsbin.com/vaculorita/1/edit?css,js,output

i'm not sure jquery's offset trying combination of switching absolute positioning , manually using getboundingclientrect works me.

html

<div id="tooltip">tooltip</div> <input type="text" id="username">

css

#username {   margin-left: 54px;   margin-top: 21px; }  #tooltip {   position: absolute;   left: 0;   top:0; }

js

$(function() {   function movetooltip() {     var $tooltip = $('#tooltip').first();     var $input = $('#username').first();     var rect = $input.get(0).getboundingclientrect();     $tooltip.css('left', rect.left + $input.width());     $tooltip.css('top', rect.top + $input.height());    }    movetooltip();    $(window).on('resize scroll', movetooltip); });

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