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[git.ikiwiki.info.git] / doc / ikiwiki / directive / meta.mdwn

diff --git a/doc/ikiwiki/directive/meta.mdwn b/doc/ikiwiki/directive/meta.mdwn
index 955648cac5005cd888ca51015b36583f0269d291..777712f32eaaaad50be28a02ba635c669b9c0b1c 100644 (file)
--- a/doc/ikiwiki/directive/meta.mdwn
+++ b/doc/ikiwiki/directive/meta.mdwn
@@ -13,7 +13,7 @@ per `meta` directive, use more directives if you want to specify more fields.
 The field values are treated as HTML entity-escaped text, so you can include
 a quote in the text by writing `"` and so on.
 
-Supported fields:
+## Supported fields
 
 * title
 
@@ -75,8 +75,13 @@ Supported fields:
 
 * date
 
-  Specifies the creation date of the page. The date can be entered in
-  nearly any format, since it's parsed by [[!cpan TimeDate]].
+  Specifies the creation date of the page. This creates a 
+  `<meta name="date" content="...">` header in the HTML output, but also
+  modifies the internal `ctime` in the
+  [[!iki tips/inside_dot_ikiwiki desc="internal index"]].
+  The date can be entered in nearly any format, since it's parsed by
+  [[!cpan TimeDate]] but invalid dates yield an error in 3.20180321
+  or later.
 
 * stylesheet
 
@@ -193,7 +198,8 @@ Supported fields:
   modification time, like Planet: for instance, when editing an old blog post
   to add tags, you could set `updated` to be one second later than the original
   value. The date/time can be given in any format that
-  [[!cpan TimeDate]] can understand, just like the `date` field.
+  [[!cpan TimeDate]] can understand, just like the `date` field and maps to the
+  `<meta name="updated" content="...">` HTML header and internal `mtime` field.
 
 * foaf
 
@@ -204,9 +210,25 @@ Supported fields:
 
        \[[!meta foaf=foaf.rdf]]
 
+* name
+
+  Adds a HTML `<meta>` header with this `name` attribute. Its other attributes are
+  taken from the other parameters, so for example
+  `\[[!meta name="foo" content="bar" x-non-standard-attribute="baz"]]`
+  becomes `<meta name="foo" content="bar" x-non-standard-attribute="baz">`. This
+  won't be allowed if the [[!iki plugins/htmlscrubber desc=htmlscrubber]] plugin is enabled,
+  since it can be used to insert unsafe content.
+
+## Other fields
+
 If the field is not one of the above predefined fields, the metadata will be
-written to the generated html page as a &lt;meta&gt; header. However, this
-won't be allowed if the [[!iki plugins/htmlscrubber desc=htmlscrubber]] plugin is enabled,
-since it can be used to insert unsafe content.
+written to the generated html page as a &lt;meta&gt; header. For example,
+`\[[!meta foo="bar"]]` becomes `<meta name="foo" content="bar">`. As
+with `name`, this won't be allowed if the [[!iki plugins/htmlscrubber
+desc=htmlscrubber]] plugin is enabled.
+
+This syntax cannot be used for meta headers with unusual names, in
+particular names containing `:` such as `flattr:id` and `twitter:card`.
+Please use `\[[!meta name="..." content="..."]]` for those headers.
 
 [[!meta robots="noindex, follow"]]