to reflect the effect, 1.js is a large file.
<body>
Hello
<script src="1.js" defer>
</script>
</body>
after visiting the page, you should immediately display "Hello", and then continue to load js, in the background, but it will go blank on Safari at the beginning, and wait until js loads before displaying "Hello".
both MacOS 11.13.4 and iOS 11.3 have this problem, while the latest Google and Firefox are fine.
could you tell me how to solve the problem?