<h1>Check me out</h1>
h1 {
  color: #fff;
  text-decoration: underline;  
  writing-mode: vertical-lr;
  text-underline-position: left;
  text-underline-offset: 30%;
}









body {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  background-color: hsl(32, 100%, 50%);
}

@supports not (text-underline-offset: auto) {
  body::before {    
    content: "Your browser doesn't support text-underline-offset";
    display: block;
    color: #e43;
    font-weight: bold;
    background-color: #fff;
    padding: 1em;
    position: fixed;
    top: 20px;
    left: 0;
    right: 0;
    text-align: center;
  }
}

External CSS

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External JavaScript

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