async

A boolean attribute indicating that the browser should, if possible, execute the script asynchronously. This attribute must not be used if the <code>src</code> attribute is absent (i.e. for inline scripts). If it is included in this case it will have no effect. <br> <br> Dynamically inserted scripts execute asynchronously by default, so to turn on synchronous execution (i.e. scripts execute in the order they were loaded) set async=false See <a href="#Browser_compatibility">Browser compatibility</a> for notes on browser support. See also <a href="/en-US/docs/Games/Techniques/Async_scripts">Async scripts for asm.js</a>.