See https://bugs.webkit.org/show_bug.cgi?id=192507. Although the bug of leading whitespaces should be fixed, an error message should have been exposed to tell about the failure in the parsing.
This bug is about reviewing all the places in the SVG properties parsing code where an error could happen and not having a corresponding error message revealed in the console window of the WebInspector.
This also shows that we do not have enough layout tests which should cover the parsing errors in the SVG properties.
It can be frustrating for the web developer to not see the SVG element rendered and no hint what went wrong especially if other web browsers can render the same markup as he expects.