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by onion2k 3274 days ago
Now that the DOM API is implemented in a standards-compliant way across most browsers...

At Facebook 'most browsers' has a very different meaning compared to other websites. When Facebook deploys code that works for 99.5% of their users that means they're failing ~10,000,000 people. Consequently they have a lot of code to handle the cases where they can't just rely on 'most browsers'. It's entirely valid that they maintain a relatively large library, and pretty awesome that they share it publicly.