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http://dev.w3.org/csswg/cssom-view/#terminology [[ The term # SVG layout box refers to the same term in SVG. ]] This needs to be clarified. The stroke-width influenced the box in IE11, but not in the other browsers. TC: http://jsfiddle.net/N6wF7/ A clip-path did not influence the reported box in any of the implementations, TC: http://jsfiddle.net/zxYp6/. Markers influenced the reported box in Firefox and IE, but not in Presto or Chrome. Note that IE reports a different box than Firefox, even though the rendering looks the same. TC: http://jsfiddle.net/bp59B/ It should be possible to define this term by using the new getBBox method in SVG2: https://svgwg.org/svg2-draft/types.html#SVGBoundingBoxOptions. Browsers tested: Chrome 34.0.1788.0 dev, Opera 12.16 (Presto), Firefox Nightly 29.0a1 (2014-01-08), IE 11.0.9600.16438.
fs says what Gecko does now seems closer to SVG's "decorated bounding box"