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Nguyễn Đức Hào 2020-09-26 09:16:33 +07:00 • committed by GitHub
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2-ui/5-loading/02-script-async-defer/article.md
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In modern websites, scripts are often "heavier" than HTML: their download size is larger, and processing time is also longer.
When the browser loads HTML and comes across a `<script>...</script>` tag, it can't continue building the DOM. It must execute the script right now. The same happens for external scripts `<script src="..."></script>`: the browser must wait until the script downloads, execute it, and only after process the rest of the page.
When the browser loads HTML and comes across a `<script>...</script>` tag, it can't continue building the DOM. It must execute the script right now. The same happens for external scripts `<script src="..."></script>`: the browser must wait for the script to download, execute the downloaded script, and only then can it process the rest of the page.
That leads to two important issues: