 
The headings used to document each item of the Language Reference are described in Table 20-3.
| Heading | Description | 
|---|---|
| Availability | Indicates when the item was added to ActionScript (or became an Action, if the item predates formal ActionScript). Also summarizes backward-compatibility and deprecation status. | 
| Synopsis | Illustrates the abstract syntax required by the item. Italicized code indicates text that must be provided by the programmer. | 
| Arguments | Applies to method and function entries only. Describes the parameters used with the method or function, as listed in the Synopsis. | 
| Returns | Applies to method and function entries only. Describes the return value of the method, if any. If the method does not have a return value, this heading is omitted. | 
| Access | Applies to property entries only. Describes whether the property value may be retrieved ("Read-only") or both retrieved and assigned ("Read/write"). | 
| Description | Explains how the item works and how it might be used in a practical scenario. | 
| Usage | Describes noteworthy peculiarities of the item. | 
| Bugs | Describes known problems associated with the item. | 
| Example | Offers sample code showing the item in use. | 
| See Also | Lists cross-references to related topics. | 
 
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