chromium/third_party/blink/web_tests/http/tests/devtools/elements/styles/resources/selector-line-sourcemap-header.php

<?php
   header("Content-Type:text/css");
   header("SourceMap: selector-line-sourcemap-header.php.map");
?>#container {
  background: papayawhip; }
  #container #inspected {
    color: green; }