ブラウザが css3 属性またはunits_html/css_WEB-ITnoseをサポートしているかどうかを確認します。

//判断是否支持flex布局var supportsFlex = CSS.supports("display", "flex");//判断是否支持rem单位var supportsRem = CSS.supports("width","1rem");//判断兼容性属性var supportsAPS = CSS.supports("animation-play-state")||CSS.supports("-webkit-animation-play-state")||CSS.supports("-ms-animation-play-state")||CSS.supports("-Moz-animation-play-state")||CSS.supports("-o-animation-play-state");

var supportsCSS = !!((window.CSS && window.CSS.supports) || window.supportsCSS || false);

function isString(value){    return typeof value == "string";}var docStyle = document.documentElement.style;var supportsAPS = isString(docStyle.animationPlayState)||isString(docStyle.webkitanimationPlayState)||isString(docStyle.MozanimationPlayState)||isString(docStyle.msanimationPlayState)||isString(docStyle.oanimationPlayState);