Convert relative path to absolute using JavaScript

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The most simple, efficient and correct way to do so it to just use URL api.

new URL("http://www.stackoverflow.com?q=hello").href;
//=> http://www.stackoverflow.com/?q=hello"

new URL("mypath","http://www.stackoverflow.com").href;
//=> "http://www.stackoverflow.com/mypath"

new URL("../mypath","http://www.stackoverflow.com/search").href
//=> "http://www.stackoverflow.com/mypath"

new URL("../mypath", document.baseURI).href
//=> "https://stackoverflow.com/questions/mypath"

Performance wise, this solution is on par with using string manipulation and twice as fast as creating a tag.

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