Update docs

Docs/SpecialRenderings.md

@@ -44,6 +44,8 @@
       * [Example usage of export_as_gpx](#example-usage-of-export_as_gpx)
     + [clear_location_history](#clear_location_history)
       * [Example usage of clear_location_history](#example-usage-of-clear_location_history)
+    + [auto_apply](#auto_apply)
+      * [Example usage of auto_apply](#example-usage-of-auto_apply)
 
  In a tagrendering, some special values are substituted by an advanced UI-element. This allows advanced features and visualizations to be reused by custom themes or even to query third-party API's. General usage is `{func_name()}`, `{func_name(arg, someotherarg)}` or `{func_name(args):cssStyle}`. Note that you _do not_ need to use quotes around your arguments, the comma is enough to separate them. This also implies you cannot use a comma in your args 
 
@@ -456,4 +458,27 @@ id_of_object_to_apply_this_one | _undefined_ | If specified, applies the the tag
 
  `{clear_location_history()}` 
 
+### auto_apply 
+
+ A button to run many actions for many features at once.
+
+To effectively use this button, you'll need some ingredients:
+- A target layer with features for which an action is defined in a tag rendering. The following special visualisations support an autoAction: tag_apply
+- A host feature to place the auto-action on. This can be a big outline (such as a city). Another good option for this is the [current_view](./BuiltinLayers.md#current_view)
+- Then, use a calculated tag on the host feature to determine the overlapping object ids
+- At last, add this component 
+
+name | default | description
+------ | --------- | -------------
+target_layer | _undefined_ | The layer that the target features will reside in
+target_feature_ids | _undefined_ | The key, of which the value contains a list of ids
+tag_rendering_id | _undefined_ | The ID of the tagRendering containing the autoAction. This tagrendering will be calculated. The embedded actions will be executed
+text | _undefined_ | The text to show on the button
+icon | ./assets/svg/robot.svg | The icon to show on the button
+ 
+
+#### Example usage of auto_apply 
+
+ `{auto_apply(,,,,./assets/svg/robot.svg)}` 
+
 This document is autogenerated from UI/SpecialVisualisations.ts