Self-hosted alternatives to @spectrum-web-components/base

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@spectrum-web-components/base

The `SpectrumElement` base class as created by mixing `SpectrumMixin` onto

The `SpectrumElement` base class as created by mixing `SpectrumMixin` onto `LitElement` provides text direction support via the CSS `:dir()` pseudo-class, which automatically inherits directionality from the DOM hierarchy. In a TypeScript context, it also