Do Notebooks have a default width variable? Does it set automatically?

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Or am I missing the width somewhere in this notebook?

If it sets automatically, what is the ratio?
Many thanks!

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The width variable is available in all notebooks as part of the Observable stdlib, and is a reactive variable updates when the page resizes: GitHub - observablehq/stdlib: The Observable standard library.

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Be aware that being reactive means that changing the width of the browser window will invalidate (rerun) all cells that rely on width.

If you find that to be a problem, have a look at Efficient Responsiveness / Fabian Iwand / Observable

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