GoogleChromeLabs/imagecapture-polyfill

Does this polyfill strip all metadata of an image?

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I am trying to get focal length of the webcam/selfie cam from the image taken using ImageCapture but in browsers where this is not supported and polyfill is being used I am seeing no metadata. But for chrome where ImageCapture is available natively, I can see the metadata.
Is there any option which will help me preserve the metadata?