@keyframes blink { 
   0% { 
       border: 3px solid red;
   } 
}

*[style] {
    animation: blink .5s step-end infinite alternate;
}

a:not([href]),
a:[href="#"],  
a:[href=""],  
a[href*="javascript:void(0)"] {
    animation: blink .5s step-end infinite alternate;
}

img:not([alt]), 
img[alt=""] {
    animation: blink .5s step-end infinite alternate;
} 

html:not([lang]),  
html[lang=""] { 
    animation: blink .5s step-end infinite alternate;
 }

 meta[charset]:not([charset="UTF-8"]),
 meta[charset="UTF-8"]:not(:first-child) {
    animation: blink .5s step-end infinite alternate;
 }  

meta[name="viewport"][content*="user-scalable=no"],  
meta[name="viewport"][content*="maximum-scale"],  
meta[name="viewport"][content*="minimum-scale"] {
    animation: blink .5s step-end infinite alternate;
} 

input:not([id]),  
select:not([id]),  
textarea:not([id]) {
    animation: blink .5s step-end infinite alternate;
}

label:not([for]) {
    animation: blink .5s step-end infinite alternate;
}  

input:not([name]),  
select:not([name]),  
textarea:not([name]) {
    animation: blink .5s step-end infinite alternate;
}  

form:not([name]):not([id]) {
    animation: blink .5s step-end infinite alternate;
}  

button:empty,  
a:empty {
    animation: blink .5s step-end infinite alternate;
}  

script[type="text/javascript"],  
link[rel="stylesheet"][type="text/css"] {
    animation: blink .5s step-end infinite alternate;
}