var ewww_webp_supported=false;
function check_webp_feature(feature, callback){
callback=(typeof callback!=='undefined') ? callback:function(){};
if(ewww_webp_supported){
callback(ewww_webp_supported);
return;
}
var kTestImages={
alpha: "UklGRkoAAABXRUJQVlA4WAoAAAAQAAAAAAAAAAAAQUxQSAwAAAARBxAR/Q9ERP8DAABWUDggGAAAABQBAJ0BKgEAAQAAAP4AAA3AAP7mtQAAAA==",
};
var img=new Image();
img.onload=function (){
ewww_webp_supported=(img.width > 0)&&(img.height > 0);
if(callback){
callback(ewww_webp_supported);
}};
img.onerror=function (){
if(callback){
callback(false);
}};
img.src="data:image/webp;base64," + kTestImages[feature];
}
check_webp_feature('alpha');