x-toggle web component
toggles a 'dark-mode' CSS class on the document html element
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@see example dir for usage
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no dark mode styles included
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--mode-btn-color custom CSS property to style the button colour from a global stylesheet
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@see https://developer.mozilla.org/en-US/docs/Web/CSS/Using_CSS_custom_properties
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@see https://developer.mozilla.org/en-US/docs/Web/Web_Components