Where can I find documentation for this variant of google maps api?

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Where can I find documentation for this dosline.ru/test.php variant of google maps api? Here it is possible to get the width and longitude using the label

Answer 1

There is no "option", it's just that there is a script written for a specific version of Google Maps, the best "documentation" for this example is to examine its code if you know how, and if not, then it's worth learning.