HTML CSS
(a quick guide)
CSS KEYFRAMES @keyframes blinkingA { 0% { background: red; } 100% { background: green; } }
ATTACH KEYFRAME ANIMATION #demoA { width: 300px; height: 300px; animation: blinkingA 1s infinite; }
THE HTML <div id="demoA"></div>
CSS KEYFRAMES @keyframes blinkingB { 0% { color: red; } 100% { color: green; } }
ATTACH KEYFRAME ANIMATION #demoB { font-size: 1.2em; font-weight: 700; animation: blinkingB 1s infinite; }
THE HTML <div id="demoB">BLINK!</div>