@zeix/ui-element/docs-src/components/callout-box/callout-box.html

UIElement - minimal reactive framework based on Web Components

<callout-box>This is an informational message.</callout-box>
<callout-box class="tip">Remember to hydrate while coding!</callout-box>
<callout-box class="caution">Be careful with this operation.</callout-box>
<callout-box class="danger">This action is irreversible!</callout-box>
<callout-box class="note">This is just a side note.</callout-box>