Hi, 4 years ago, the SVG WG resolved to remove SVGTests.hasExtension due to lack of use and being a poor API. It was removed from Chromium at that time and has been removed from Firefox recently.
I'm not sure whether the WebKit community is willing to keep that feature. Anyway I opened a bug entry to track possible removal: https://bugs.webkit.org/show_bug.cgi?id=198652 -- Frédéric Wang
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