cssOMS/debug.css

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

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

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

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

img:not([alt]),
img[alt=""],
img[alt=" "],
[role="img"]:not([aria-label]):not([aria-labelledby]),
svg[role="img"]:not([aria-label]):not([aria-labelledby]),
img[src=""],
img[src=" "],
img[src="#"],
img[src="/"] {
    animation: blink .5s step-end infinite alternate;
}

html:not([lang]),
html[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]),
input[type="text"]:not([autocomplete]),
input[type=""],
select:not([id]),
textarea:not([id]) {
    animation: blink .5s step-end infinite alternate;
}

label:not([for]),
label[for=""],
label[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([id]), form[id=""],
form:not([name]):not([id]),
form:not([action]),
form[action=" "],
form[action=""] {
    animation: blink .5s step-end infinite alternate;
}

button:empty,
button:empty:not([aria-label]):not([aria-labelledby]):not([title]),
button:blank:not([aria-label]):not([aria-labelledby]):not([title]),
button[aria-label=""],
button[aria-labelledby=""],
button[title=""],
button:not([type]):not([form]):not([formaction]):not([formtarget]) {
    animation: blink .5s step-end infinite alternate;
}

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

table[role="presentation"] th,
table[role="presentation"] thead,
table[role="presentation"] tfoot,
table[role="presentation"] caption,
table[role="presentation"] colgroup,
table[role="presentation"] [axis],
table[role="presentation"] [scope],
table[role="presentation"] [headers] {
    animation: blink .5s step-end infinite alternate;
}

[onafterprint], [onbeforeprint], [onbeforeunload],
[onerror], [onhaschange], [onload], [onmessage],
[onoffline], [ononline], [onpagehide], [onpageshow],
[onpopstate], [onredo], [onresize], [onstorage],
[onundo], [onunload],
[onblur], [onchage], [oncontextmenu], [onfocus],
[onformchange], [onforminput], [oninput], [oninvalid],
[onreset], [onselect], [onsubmit],
[onkeydown], [onkeypress], [onkeyup],
[onclick], [ondblclick], [ondrag], [ondragend],
[ondragenter], [ondragleave], [ondragover],
[ondragstart], [ondrop], [onmousedown], [onmousemove],
[onmouseout], [onmouseover], [onmouseup], [onmousewheel],
[onscroll],
[onabort], [oncanplay], [oncanplaythrough],
[ondurationchange], [onemptied], [onended], [onerror],
[onloadeddata], [onloadedmetadata], [onloadstart],
[onpause], [onplay], [onplaying], [onprogress],
[onratechange], [onreadystatechange], [onseeked],
[onseeking], [onstalled], [onsuspend], [ontimeupdate],
[onvolumechange], [onwaiting] {
    animation: blink .5s step-end infinite alternate;
}

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

[dir]:not([dir="rtl"]):not([dir="ltr"]):not([dir="auto"]) {
    animation: blink .5s step-end infinite alternate;
}

[type="radio"]:not([name]),
[type="checkbox"]:not(:only-of-type):not([name]) {
    animation: blink .5s step-end infinite alternate;
}

ul > :not(li),
ol > :not(li),
:not(ul):not(ol) > li {
    animation: blink .5s step-end infinite alternate;
}

:not(figure) > figcaption {
    animation: blink .5s step-end infinite alternate;
}

figure:not([role="group"]) {
    animation: blink .5s step-end infinite alternate;
}

:not(tr) > td,
:not(tr) > th,
colgroup *:not(col),
:not(colgroup) > col,
tr > :not(td):not(th),
optgroup > :not(option),
:not(select) > optgroup,
:not(fieldset) > legend,
select > :not(option):not(optgroup),
:not(select):not(optgroup) > option,
table > *:not(thead):not(tfoot):not(tbody):not(tr):not(colgroup):not(caption) {
    animation: blink .5s step-end infinite alternate;
}

[target$="blank"]:not([rel]),
[target$="blank"]:not([rel*="noopener"]),
[target$="blank"]:not([rel*="noreferrer"]) {
    animation: blink .5s step-end infinite alternate;
}