Upgrade to release v2.4.0

README.md

@@ -283,7 +283,18 @@ _object_ the templates configuration for rendering each preview file type. The f
 - `audio`: the preview template for audio files (supported by HTML 5 audio tag).
 - `flash`: the preview template for flash files (supported currently on webkit browsers).
 - `object`: the preview template for all other files - by default treated as object. To disable this behavior, configure the `allowedPreviewTypes` property.
-- `generic`: this template is used ONLY for rendering the `initialPreview` markup content passed directly as a raw format. The special tag `{content}` will be parsed and replaced with the `initialPreview` markup.
+- `generic`: this template is used ONLY for rendering the `initialPreview` markup content passed directly as a raw format. 
+
+The following tags will be parsed and replaced in each of the templates:
+
+- `{previewId}`: will be replaced with the generated identifier for the preview frame container.
+- `{data}`: will be replaced with the data source for each preview type.
+- `{width}`: will be replaced with the width for the file type as set in `previewSettings`.
+- `{height}`: will be replaced with the height for the file type as set in `previewSettings`.
+- `{caption}`: will be replaced with the file name.
+- `{type}`: will be replaced with the file type.
+- `{content}`: this is applicable only for the `generic` template. It will be  with the raw HTML markup as set in `initialPreview`. None of 
+   the above tags will be parsed for the `generic` template.
 
 As noted, if you are coming from an earlier release (before v2.4.0), all preview templates have now been combined into one property, instead of separate templates for image, text etc.