Modern Web Developer tools (in Chrome / FF / IE, eg.) provide a way to see the "Box Model" and "Computed CSS Properties" of a particular element. However;
Is there a way to monitor the final computed/layout position easily with such tools?
Preferably absolute, but within the parent container is also suitable. I am amendable to using any of the previously mentioned [Windows] browsers, but prefer to use Chrome.
In Chrome, Firefox, Edge and IE11+, when an element is selected, you can access this element in the console window by typing:
$0
You can then query and manipulate using the Javascript DOM API, which has a very useful method called Element.getBoundingClientRect().
So all you have to do is type the following into the console window when an element is selected:
$0.getBoundingClientRect()
and the browser will return an object such as:
{ x: 1081, y: 72, width: 49, height: 28, top: 72, right: 1130, bottom: 99, left: 1081 }
Chrome dev tools -> Settings -> General -> Elements -> Show Rulers.
You can also install Chrome plugins that will give you a little more functionality.
来源：https://stackoverflow.com/questions/26820942/browser-developer-tools-what-is-the-position-of-the-html-element