atk/LICENSE.txt

## README.md

      
    Raw
  

              README.md
            
          
    Offset

Will return an object that at least have a "left" and a "top" property. If the getBoundingClientRect method is present, the position will be relative to the viewpoint, otherwise it will be absolute, so the results will only coincide if the viewport is 0,0 (initial page load should suffice). In some circumstances, the fallback will be imprecise, but you can only do so much with 138 bytes.
Thanks to @jbebe for inspiring me to the recursive approach and to @jed for having this funny little challenge with me.

  
## annotated.js
function o(
  a,
  x,
  y,
  z
){
  // if a is present and supports the getBoundingClient method
  return a && a[z='getBoundingClientRect'] ?
    // use it
    a[z]() :
    // otherwise check if a is present
    // (document.body.offsetParent === null)
    a ?
        // if yes, recursively call
        o(
          // with the offset parent
          a.offsetParent,
          // and a normalized x
          ~~x+~~a.offsetLeft,
          // and y value increased by the relative offset
          ~~y+~~a.offsetTop
        ) :
        // otherwise return the offset object composed from x and y
        { left: x, top: y }
}

## index.js
function o(a,x,y,z){return a&&a[z='getBoundingClientRect']?a[z]():a?o(a.offsetParent,~~x+~~a.offsetLeft,~~y+~~a.offsetTop):{left:x,top:y}}

## LICENSE.txt
            DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
                    Version 2, December 2004

 Copyright (C) 2013 Alex Kloss <alexthkloss@web.de>

 Everyone is permitted to copy and distribute verbatim or modified
 copies of this license document, and changing it is allowed as long
 as the name is changed.

            DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION

  0. You just DO WHAT THE FUCK YOU WANT TO.

## package.json
{
  "name": "offset",

  "description": "Primitive DOM offset function with fallback for getBoundingClientRect",

  "keywords": [
    "DOM",
    "node",
    "offset",
    "fallback",
    "getBoundingClientRect"
  ]
}

## test.html
<!DOCTYPE html>
<title>Foo</title>
<div>Expected value: <b>left: x, top: y</b> (values may differ depending on browser/-settings)</div>
<div>Actual value: <b id="ret"></b></div>
<script>
  function o(a,x,y,z){return a&&a[z='getBoundingClientRect']?a[z]():a?o(a.offsetParent,~~x+~~a.offsetLeft,~~y+~~a.offsetTop):{left:x,top:y}}
  var ret = document.getElementById( "ret" ), offset = o(ret);
  ret.innerHTML = 'left: '+offset.left+', top: '+offset.top;
</script>
	function o(
	a,
	x,
	y,
	z
	){
	// if a is present and supports the getBoundingClient method
	return a && a[z='getBoundingClientRect'] ?
	// use it
	a[z]() :
	// otherwise check if a is present
	// (document.body.offsetParent === null)
	a ?
	// if yes, recursively call
	o(
	// with the offset parent
	a.offsetParent,
	// and a normalized x
	~~x+~~a.offsetLeft,
	// and y value increased by the relative offset
	~~y+~~a.offsetTop
	) :
	// otherwise return the offset object composed from x and y
	{ left: x, top: y }
	}
	DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
	Version 2, December 2004

	Copyright (C) 2013 Alex Kloss <alexthkloss@web.de>

	Everyone is permitted to copy and distribute verbatim or modified
	copies of this license document, and changing it is allowed as long
	as the name is changed.

	DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
	TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION

	0. You just DO WHAT THE FUCK YOU WANT TO.
	{
	"name": "offset",

	"description": "Primitive DOM offset function with fallback for getBoundingClientRect",

	"keywords": [
	"DOM",
	"node",
	"offset",
	"fallback",
	"getBoundingClientRect"
	]
	}
	<!DOCTYPE html>
	<title>Foo</title>
	<div>Expected value: <b>left: x, top: y</b> (values may differ depending on browser/-settings)</div>
	<div>Actual value: <b id="ret"></b></div>
	<script>
	function o(a,x,y,z){return a&&a[z='getBoundingClientRect']?a[z]():a?o(a.offsetParent,~~x+~~a.offsetLeft,~~y+~~a.offsetTop):{left:x,top:y}}
	var ret = document.getElementById( "ret" ), offset = o(ret);
	ret.innerHTML = 'left: '+offset.left+', top: '+offset.top;
	</script>