singleton to wrap contents (tag, text, HTML, or lists) that should
be included in the generated document only once, yet may appear in the
document-generating code more than once. Only the first appearance of the
content (in document order) will be used.
1 2 3
Whether the object should be a singleton.
Add the following code to your website.
For more information on customizing the embed code, read Embedding Snippets.