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ids: A comma-separated list of Google Calendar IDs.
url: A comma-separated list of valid, encoded URLs.
limit: Number of elements to display. Max of 100. Defaults to 5.
filter: Only displays items that contain the filter value in the event title.
key: Use 'date-in-description' if the <pubDate> is not the event date and the date is contained in the description.
words: Number of words to truncate the description to. Defaults to 20.