I'm experiencing an issue with an SVG mask animation in iOS only. Happens in iOS Safari & Chrome. I'm using the MorphSVG and Draw SVG plugins to create the animation (see codepen -sorry the html is a mess - it's generated dynamically so I've done a copy/paste)   On iOS the animation doesn't run at all, in fact nothing shows up. It works fine on Android, also works on all desktops and I'm totally baffled. Any ideas?      All help much appreciated!!