Manages the page's canonical URL.
| Name | Type | Description |
|---|---|---|
| upsertCache | string | Stores the upserted SEO data since the last clear. This represents the SEO data managed by the service. |
| restoreCache | string | Stores the SEO data present on the current document when it is removed by `clear`. SEO data in this cache can be upserted back into the document with `restore`. |
| canonicalLink | HTMLLinkElement | The canonical link element. |
| upsert | void | Adds the SEO info to the page. Adds the info to the upsert cache. |
| clear | void | Removes all of the added SEO info from the page. Only removes what was previously added by this service, that is, what is in the upsert cache. The SEO data that was removed is then moved to the restore cache. |
| restore | void | Restores the previously cleared SEO info to the page. |
| emptyRestoreCache | void | Empties the restore cache. Does not affect upsert cache. |