Show a note near the element

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Create a function positionAt(anchor, position, elem) that positions elem, depending on position near anchor element.

The position must be a string with any one of 3 values:

"top" – position elem right above anchor
"right" – position elem immediately at the right of anchor
"bottom" – position elem right below anchor

It’s used inside function showNote(anchor, position, html), provided in the task source code, that creates a “note” element with given html and shows it at the given position near the anchor.

Here’s the demo of notes:

Open a sandbox for the task.

In this task we only need to accurately calculate the coordinates. See the code for details.

Please note: the elements must be in the document to read offsetHeight and other properties. A hidden (display:none) or out of the document element has no size.

Open the solution in a sandbox.