Gets and sets the URL to the HTML file that will be displayed in the palette. This can be a local file or a URL on the web where the HTML will be read. To avoid reading a file, this can also be the full HTML definition as a string.
If you are providing the HTML content as a string, it should begin with the element. Any references made in the HTML should be to URL's and not local files since the local path is ambiguous.
"palette_var" is a variable referencing a Palette object.
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"palette_var" is a variable referencing a Palette object.
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