Color picker
A color, chosen with the color picker of WordPress, such as the accent color of a theme.
In the editor

Besides the settings every field shares, a color picker has:
| Setting | What it does |
|---|---|
| Default color (HEX) | The color the option gets when you save the menu, as long as it has no value yet, such as #0e7490. |
On the options page

Click Select Color to open the picker, or type a hex color.
The value
Stores a hex color with a #, such as #0e7490. A value that is not a hex color is refused: the options page says so, and the previous color is kept.
On your website
printf( '<style>:root { --accent: %s; }</style>', esc_attr( get_option( 'accent_color', '#0e7490' ) ) );
[aop_option name="accent_color"]