In reply to this conservation:
Find it a little sad some of the browser APIs are introduced in such an incomplete state the only way to use them is in try/catch blocks
– Glenn Jones on twitter
@glennjones are these implementation issues or spec ones?
– Tobie Langel on twitter
@tobie the examples for URL and URLUtils polyfills are having to use try/catch to get around this. Similar issues with DOMParser
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