When getBBox() is called on a <path> element, the correct bounding box is returned (one that does not include path control points). However, when the same <path> is wrapped in a <g> element, and getBBox() is called on the <g>, the returned bounding box includes the path's control points. The bounding box for a <g> wrapping a <path> should be the same as the bounding box of the <path> on its own. This jsfiddle illustrates the problem: http://jsfiddle.net/3t8u9qyb/ Bug is present in Safari 10.1.2, Google Chrome for Mac 61.0.3163.91 and Google Chrome for Windows 62.0.3202.18 . Also present in Safari for iOS (10.3.3) Firefox on Windows, IE11 and Edge all show the correct behavior.
Safari, Chrome, and Firefox all agree on rendering for this test case. I don't believe there is any remaining compatibility issue.