RGraph is a JavaScript charts library based on HTML5 SVG and canvas. RGraph is mature (over 15 years old) and has a wealth of features making it an ideal choice to show charts on your website.

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Get the latest version of RGraph (version 6.17) from the download page. There's also older versions available, minified files and links to cdnjs.com hosted libraries.

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RGraph can be used for free under the GPL or if that doesn't suit your situation there's an inexpensive (£99) commercial license available.

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It would be great if the demos could have a stand alone page with nothing but the code used to demonstrate the chart, including the version of the code, etc. The current demo pages have a lot of noise that make it difficult to simply pull out the required code (and to see it responsively)

Which demos are you referring to? The ones that are shown on this page:

https://www.rgraph.net/demos/index.html

All the code that you need is in the three code blocks - the <script> tags, the <canvas> tag and the JavaScript code.

OK, now each of the demo pages has a link to a cutdown version of the demo with nothing but the chart on it.

For example, try this demo:

https://www.rgraph.net/demos/bar-3d-effect-multi-row.html

You'll need to view the source if you want the source-code and HTML - but it's not complicated.

Well, its actually no documentation, just examples. This requires a lot of try and error to find out about the effect of each paramter..

Then consult the API documentation.