Docs updates

editions/tw5.com/tiddlers/Pragma_ _function.tid

@@ -0,0 +1,25 @@
+created: 20221009162634214
+modified: 20221009163238956
+tags: Pragmas
+title: Pragma: \function
+type: text/vnd.tiddlywiki
+
+<<.from-version "5.3.0">> The ''\function'' [[pragma|Pragmas]] is used to [[define custom functions|Functions]]. It is a shortcut syntax for the SetVariableWidget.
+
+The usual form allows custom functions to span multiple lines:
+
+```
+\function <function-name>(<param-name>[:<param-default-value>],<param-name>[:<param-default-value>]...)
+<multiple-line-definition-text>
+\end
+```
+
+There is also a single line form for shorter functions:
+
+```
+\function <function-name>(<param-name>[:<param-default-value>],<param-name>[:<param-default-value>]...) <single-line-definition-text>
+```
+
+The first line of the definition specifies the function name and any parameters. Each parameter has a name and, optionally, a default value that is used if no value is supplied on a particular call to the function. The lines that follow contain the text of the function (i.e. the snippet represented by the function name), until `\end` appears on a line by itself:
+
+See [[Functions]] for more details.

editions/tw5.com/tiddlers/concepts/Macros.tid

@@ -1,5 +1,5 @@
 created: 20140211171341271
-modified: 20221007144757675
+modified: 20221009163114481
 tags: Concepts Reference
 title: Macros
 type: text/vnd.tiddlywiki

editions/tw5.com/tiddlers/functions/Functions.tid

@@ -1,12 +1,12 @@
 created: 20221009124003601
-modified: 20221009125246821
+modified: 20221009163124867
 tags: Concepts Reference
 title: Functions
 type: text/vnd.tiddlywiki
 
 !! Introduction
 
-A <<.def function>> is a named snippet of text containing a [[Filter Expression]]. Functions can have named parameters which are available within the function as variables.
+<<.from-version "5.3.0">> A <<.def function>> is a named snippet of text containing a [[Filter Expression]]. Functions can have named parameters which are available within the function as variables.
 
 Functions are usually defined with the [[Pragma: \function]]:
 

editions/tw5.com/tiddlers/pragmas/Pragma_ _parameters.tid

@@ -1,10 +1,10 @@
 created: 20220917113154900
-modified: 20221003121441054
+modified: 20221009163301629
 tags: Pragmas
 title: Pragma: \parameters
 type: text/vnd.tiddlywiki
 
-The ''\parameters'' [[pragma|Pragmas]] is used within [[procedure|Procedure Definitions]] and [[widget|Widget Definitions]] definitions to declare the parameters that are expected, and their default values. It is a shortcut syntax for the ParametersWidget.
+<<.from-version "5.3.0">> The ''\parameters'' [[pragma|Pragmas]] is used within [[procedure|Procedure Definitions]] and [[widget|Widget Definitions]] definitions to declare the parameters that are expected, and their default values. It is a shortcut syntax for the ParametersWidget.
 
 ```
 \parameters (<name>[:<default-value>],<name>[:<default-value>]...)

editions/tw5.com/tiddlers/pragmas/Pragma_ _procedure.tid

@@ -1,10 +1,10 @@
 created: 20221007132845007
-modified: 20221009122437394
+modified: 20221009163250309
 tags: Pragmas
 title: Pragma: \procedure
 type: text/vnd.tiddlywiki
 
-The ''\procedure'' [[pragma|Pragmas]] is used to [[define procedures|Procedure Definitions]]. It is a shortcut syntax for the SetVariableWidget with an implicit ParametersWidget.
+<<.from-version "5.3.0">> The ''\procedure'' [[pragma|Pragmas]] is used to [[define procedures|Procedure Definitions]]. It is a shortcut syntax for the SetVariableWidget with an implicit ParametersWidget.
 
 The usual form allows procedures to span multiple lines:
 

editions/tw5.com/tiddlers/pragmas/Pragma_ _widget.tid

@@ -1,10 +1,10 @@
 created: 20221009121950630
-modified: 20221009122447180
+modified: 20221009163229920
 tags: Pragmas
 title: Pragma: \widget
 type: text/vnd.tiddlywiki
 
-The ''\widget'' [[pragma|Pragmas]] is used to [[define custom widgets|Custom Widgets]]. It is a shortcut syntax for the SetVariableWidget with an implicit ParametersWidget.
+<<.from-version "5.3.0">> The ''\widget'' [[pragma|Pragmas]] is used to [[define custom widgets|Custom Widgets]]. It is a shortcut syntax for the SetVariableWidget with an implicit ParametersWidget.
 
 The usual form allows custom widgets to span multiple lines:
 

editions/tw5.com/tiddlers/procedures/Procedures.tid

@@ -1,12 +1,12 @@
 created: 20221007124007426
-modified: 20221007144806995
+modified: 20221009163145607
 tags: Concepts Reference
 title: Procedures
 type: text/vnd.tiddlywiki
 
 !! Introduction
 
-A <<.def procedure>> is a named snippet of text. They are typically defined with the [[Pragma: \procedure]]:
+<<.from-version "5.3.0">> A <<.def procedure>> is a named snippet of text. They are typically defined with the [[Pragma: \procedure]]:
 
 ```
 \procedure my-procedure(parameter:"Default value")

editions/tw5.com/tiddlers/widgets/Custom Widgets.tid

@@ -1,12 +1,12 @@
 created: 20221007144237585
-modified: 20221009121901496
+modified: 20221009163155576
 tags: Concepts Reference
 title: Custom Widgets
 type: text/vnd.tiddlywiki
 
 !! Introduction
 
-A <<.def "custom widget">> is a special kind of [[procedure|Procedures]] that can be called using the same syntax as widgets.
+<<.from-version "5.3.0">> A <<.def "custom widget">> is a special kind of [[procedure|Procedures]] that can be called using the same syntax as widgets.
 
 Custom widgets can also be used to override built-in JavaScript widgets to customise their behaviour.