async vs defer attributes

The async and defer attributes for the <script> element have great support now, so it’s time to learn exactly what they do! <script> Let’s start by defining what <script> without any attributes does. The HTML file will be parsed until the script file is hit, at that point parsing will stop and a request will be made to fetch the file (if it’s external). The script will then be executed before pars

[hxmasaki]

まとめ

[bislion]

“If the script is small and is relied upon by an async script then use an inline script with no attributes placed above the async scripts. ”

[yife]

わかりやすい

[ama-ch]

asyncとdeferの違い

[learn]

<script async>と<script defer>の比較

[serihiro]

あとで読む

[efcl]

script要素のasync属性とdefer属性の動作の違いを図解にしたもの http://tokkono.cute.coocan.jp/blog/slow/index.php/xhtmlcss/resource-potitioning-best-practice/