The following attributes will be placed on the <html> element. These can be used for CSS selectors or JS DOM APIs.
data-theme - which will contain the preferred theme keys for each color mode, e.g. light:original would be specifying the key of the preferred theme for light mode is original. Note: any other data contained here is not to be relied upondata-color-mode - will be the color mode to be rendered, e.g. light or dark. This will be updated if the color mode to be used changesdata-color-mode-auto - will be present when the color mode should follow the user's browserEverything else is undefined and should not be relied upon.
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