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https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Properties/outline-style
outline-style CSS property - CSS | MDN
The outline-style CSS property sets the style of an element's outline. An outline is a line that is drawn around an element, outside the border.
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https://css-tricks.com/almanac/properties/o/outline/outline-style/
outline-style | CSS-Tricks
Aug 16, 2021 - The outline-style CSS property specifies the style of an element's outline. What’s an outline? An outline is a line that is drawn around elements — outside
outline style csstricks
https://webref.ru/css/outline-style
outline-style | CSS | WebReference
Свойство outline-style задаёт стиль контура элемента.
outline style csswebreference