A plugin for the svgjs library which gets the bbox of a path/polygon/polyline after all transformations applied.
The returned bounding box is in the screens coordinate space which means that the scroll offset is not applied (same as with screenCTM)
bower install svg.screenbbox.js
// add some viewbox madness to make this more interesting
var nested = draw.viewbox(0, 0, 300, 200).nested().viewbox(-50, 20, 200, 300)
// create path with transformation
var path = draw.path('M150 0 L75 200 L225 200 Z').rotate(25).scale(0.5)
// get bounding box in screen coordinates
var bbox = path.screenBBox()
// do something with it, e.g. draw a reactangle around (with jQuery here)
$('<div>').css({
position:'absolute',
width:bbox.width,
height:bbox.height,
left:bbox.x+window.pageXOffset, // dont forget to add the scroll offset
top:bbox.y+window.pageYOffset, // dito
outline:'3px solid black'
}).appendTo('body')This module requires svg.js >= v2.2.0