CSS variables, more accurately known as CSS custom properties, are landing in Chrome 49. CSS is going to be like a CSS pre-processor itself such as SASS, LESS in the future. CSS variables are now officially part of the CSS specification
:root {
--main-color: #F06D06;
}
.main-header {
color: var(--main-color);
}
.main-footer {
background-color: var(--main-color);
}
