Codebase Browser
chromium
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chromium/chrome/browser/resources/pdf/ink/index.html 

<!DOCTYPE html>
<script src="ink_loader.js"></script>
<script src="ink_lib_binary.js"></script>
<script type="module" src="ink_api.js"></script>
<style>
body {
  height: 100vh;
  margin: 0;
  overflow: hidden;
  width: 100vw;
}
</style>