The 'outline-color' property specifies a color for the outline for an element.

The outline properties create a uniform line around an object in order to draw visual attention. An outline is slightly different than a border in several ways: An outline is drawn starting "just outside the border edge" and is allowed to be non-rectangular. Outlines are always rendered on TOP of an element's rendering box and do not influence the box's position or size calculation; the document does not need to be re-flowed when a border is rendered or hidden, but the outline may overlap other nearby elements.

img { outline-color: black }
Possible Values
inherit: Explicitly sets the value of this property to that of the parent
invert: This value inverts the color of the outline to the opposite value of the color "underneath" the outline to ensure proper contrast
color: Sets the border to the indicated color value

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