Renders the metadata value with the given key from the current document.
The metadata value will be rendered as a string. If no value exists with the
specified key, nothing will be rendered. In addition to using the shortcode
by the
Meta name like <?# Meta key /?>, this shortcode can also be used
with a special syntax: <?#= key /?>.
Parameters
The following parameters can be used without names in the order below or with names (provided they are named) in any order. When using named parameters, the syntax should be `Name=Value` or `Name="Value"`.
-
The key of the metadata value to render.