Websites/webkit.org/wp-content/themes/webkit/images/invert-lightness.svg

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<svg xmlns="http://www.w3.org/2000/svg">
	<style> svg { display: block; width: 0; height: 0; } </style>
    <filter id="invertLightness" x="0" y="0" style="color-interpolation-filters: sRGB">
        <feColorMatrix type="matrix" in="SourceGraphic" result="red" values="1 0 0 0 0 1 0 0 0 0 1 0 0 0 0 0 0 0 0 1" />
        <feColorMatrix type="matrix" in="SourceGraphic" result="green" values="0 1 0 0 0 0 1 0 0 0 0 1 0 0 0 0 0 0 0 1" />
        <feColorMatrix type="matrix" in="SourceGraphic" result="blue" values="0 0 1 0 0 0 0 1 0 0 0 0 1 0 0 0 0 0 0 1" />
        <feBlend in="red" in2="green" mode="lighten" result="maxyellow" />
        <feBlend in="maxyellow" in2="blue" mode="lighten" result="max" />
        <feBlend in="red" in2="green" mode="darken" result="minyellow" />
        <feBlend in="minyellow" in2="blue" mode="darken" result="min" />
        <feComponentTransfer result="adjustment" in="min">
            <feFuncR type="linear" intercept="1" slope="-1" />
            <feFuncG type="linear" intercept="1" slope="-1" />
            <feFuncB type="linear" intercept="1" slope="-1" />
        </feComponentTransfer>
        <feComposite operator="arithmetic" in="SourceGraphic" in2="adjustment" k1="0" k2="1" k3="1" k4="-1" result="channelAdjustment" />
        <feComposite operator="arithmetic" in="channelAdjustment" in2="max" k1="0" k2="1" k3="-1" k4="1" result="finalColors" />
        <feComposite operator="in" in="finalColors" in2="SourceAlpha" />
    </filter>
</svg>