Example 2 on project page does not load image in WebKit

[cburgmer]

See #69

[cburgmer]

Opening http://cburgmer.github.io/rasterizeHTML.js/ with the Safari developer tools shows the rendered image under "Resources". The second resource starting with "data:image/svg+xml;charset=..." shows the rendered image, initially also omitting the image. Double clicking opens the image in another tab and correctly renders the image. Going back to the project page and re-triggering the draw operation by pressing a random key now makes the tiger image appear.

This looks like similar behaviours from the past as documented in https://github.com/cburgmer/rasterizeHTML.js/wiki/Browser-issues. Not sure how to tweak Safari in correctly rendering, especially as it is impossible to reproduce locally, not even with a local webserver.

[cburgmer]

Does so now in Safari 9.1.3