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The document variable exists as a global variable when your code is running in a browser. It’s not provided by the JS engine, nor is it particularly controlled by the JavaScript specification.

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Everyone’s favorite alert(..) pops up a message box in the user’s browser window. alert(..) is provided to your JS program by the browser, not by the JS engine itself.

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Books I’ve read.

Johannes Holmberg

Tiny summaries on books I’ve read. Sorted by latest read. But you can also sort on top recommendations. Highlights and covers are copyright to their respective authors.