@litejs/ui/css/contrast.css

/**
 *  1. IE10 from Windows 7 and legacy Microsoft Edge
 *     Microsoft Edge79 supports the new standards
 *  2. As with all other keywords, these names are ASCII case-insensitive.
 *     They are shown here with mixed capitalization for legibility.
 *  3. Use transparent outline instead of removing it,
 *     in forced color modes, you'll get a visual outline,
 *     as the color will be overridden by the system colors.
 *
 * https://drafts.csswg.org/css-color-4/#css-system-colors
 * https://www.a11yproject.com/posts/2020-01-23-operating-system-and-browser-accessibility-display-modes/
 * https://blogs.windows.com/msedgedev/2020/09/17/styling-for-windows-high-contrast-with-new-standards-for-forced-colors/
 *
 * Internet Explorer and legacy Microsoft Edge    | New Microsoft Edge and web standards
 * @media (-ms-high-contrast: active) {}          | @media (forced-colors: active) {}
 * @media (-ms-high-contrast: black-on-white) {}  | @media (forced-colors: active) and (prefers-color-scheme: light) {}
 * @media (-ms-high-contrast: white-on-black) {}  | @media (forced-colors: active) and (prefers-color-scheme: dark) {}
 * -ms-high-contrast-adjust: none;                | forced-color-adjust: none;
 */

@media (-ms-high-contrast: active), (forced-colors: active) {
	.preserveOriginalColors {
		-ms-high-contrast-adjust: none;      /* 1 */
		forced-color-adjust: none;
	}
	.useSystemColors {
		background-color: Window;            /* 1 */
		background-color: Canvas;            /* 2 */
		border-color: -ms-hotlight;          /* 1 */
		border-color: LinkText;
		color: WindowText;                   /* 1 */
		color: CanvasText;
	}
}
@media (prefers-color-scheme: dark) {
	body {
		background-color: #000;
		color: #fff;
	}
}
@media (inverted-colors: inverted) {
	img,
	video {
		filter: invert(100%);
	}
}
@media (prefers-reduced-motion: reduce) {
	.anim {
		animation: none;
	}
}

:focus {
	outline: 2px solid transparent;              /* 3 */
	box-shadow: 0 0 10px 2px rgba(0, 0, 0, .8);
}