For margin notes and supplementary information: ```markdown >[!aside] Quick Note This appears as a floating sidebar note that doesn't interrupt the main text flow. ``` >[!aside|] Quick Note This appears as a floating sidebar note that doesn't interrupt the main text flow. - Floats right by default, customizable via Style Settings - Can be positioned left with `float-left` or `left` metadata class - Ideal for definitions, related information, or commentary