Thimble is built to give you hints that help explain parts of the code, and error messages that show you when something in the code is not right.
A hint has an orange color, and shows up when you do something like select a markup tag. Click the question mark to reveal details about the hint.
An error message has a red color, and shows up when something is missing or broken. Click the exclamation point to reveal details about the error.
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