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Parse, validate, manipulate, and display dates in JavaScript
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Cybernetically enhanced web apps
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A JavaScript library for building user interfaces
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Simple, scalable state management
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Test your Internet connection bandwidth to locations around the world with this interactive broadband speed test from Ookla
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speed.cloudflare.com is a tool that allows you to measure the speed and consistency of your connection to the Internet. You can use it to verify that the speed your ISP promised you is the speed you are getting.