<head>
<title>Test of failed variable lookup because of "revert" on a custom property causing all to reset everything.</title>
<style>
html {
  font-size: small;
  background-color: #F0F0F0;
  color: blue;
  --a: revert;
}

blockquote {
  background-color: skyblue;
  color: red;
  all: var(--a);
}
</style>
</head>
<body>
<blockquote id="quote">Lorem ipsum dolor sit amet, consectetur adipiscing elit.</blockquote> Phasellus eget velit sagittis.