async attribute | async property
Provides control of when a script executes while a document loads. Setting a script to run asynchronously can improve performance by unblocking the rest of the document. When async = false, it can preserve execution order to ensure dependent scripts are run in order.
This property is read/write.
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Syntax
| HTML |
|---|
<element async="ptr" ... > |
| JavaScript |
|---|
object.async = ptr ptr = object.async |
Property values
Type: boolean
When true, the script will execute asynchronously, otherwise script is executed as page loads.
See also
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Build date: 11/28/2012
