Today, I ran over an issue with SVG foreignobject and Chrome. Basically, I needed to show a span inside a D3 chart. Of course, there is only 1 way to display an html element inside a svg is using svg:foreignObject.

	<foreignObject width="15" height="16" x="233.92277397260276" y="351">
			<span class="bowtie-icon bowtie-symbol-crown" style="color: rgb(51, 153, 51);"></span>

After that, I need to display a tooltip using d3-tip. This is how d3-tip calculate the coordination of the tooltip: matrix = targetel.getScreenCTM

targetel is the current target of mouse over event, in this case is my span.

The problem immediately shows up here when span is not a SVGElement so it doesn’t have getScreenCTM method. Easy fix! Just get its grand parent, in this case is svg:foreignObject:

	matrix = targetel.getScreenCTM ? targetel.getScreenCTM() : $(targetel).closest("foreignObject").get(0).getScreenCTM()

Everything worked fine before I updated Chrome to Version 59.0.3071.115 (Official Build) (64-bit). The matrix.e and matrix.f are not correct anymore. They are correct in Edge (Hmm I don’t know how, maybe the other way around, will update when I have answer).

Anyway, the fix is very simple. Instead of using x="233.92277397260276" y="351". Just use transform="translate(338.20770547945204,351)" on svg:foreignObject. (Again, I am not entirely sure why but it works for me).

Happy coding!

Hung Cao