I learned that caniuse.com can be enriched with your very own Google Analytics data. This can help making the right decisions.
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I learned that code that doesn't look valid can be valid... sometimes.
I learned about a trick where double clicking on a MacOS window expands the whole window.
I learned that 'console.dir' is actually only a shorthand for 'console.log' and 'util.inspect'. This can help you to save a bit of typing.
I learned that the CSS property 'background-repeat' has more values than 'repeat