<p>我们可以使用attr将一个链接的地址在打印页面的时候打印出来，比如<a href="https://www.w3cplus.com">W3cplus.com</a></p>

@import url("https://fonts.googleapis.com/css?family=Gochi+Hand");

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  width: 100vw;
  height: 100vh;
  margin: 0;
  padding: 0;
  background-color: #291642;
  font-family: "Gochi Hand", sans-serif;
  font-size: 130%;
  letter-spacing: 0.1rem;
  color: #fff;
  display: flex;
  justify-content: center;
  align-items: center;
}

@media print {
  a[href]:after {
    content: " (" attr(href) ")";
  }

  a[href^="http"]:not([href*="mywebsite.com"]):after {
    content: " (" attr(href) ")";
  }
}