canonicalUrl

is used in HTML metadata by pages that have duplicated posted elsewhere online, and helps SEO understand that the original content to be indexed and pointed to exists elsewhere. This is good if you are re-posting content (let's say blog posts to Medium, dev.to, Hashnode, etc. which all support entering a canonicalUrl value). I'm currently converting existing docs, like Microsoft docs, to Dendron vaults and want the original published doc page location to be referenced with canonicalUrl. This means an easy share of the original published doc, but also means if I publish the vault as a Dendron site that SEO (Google, other search engines) don't get messy when it discovers duplicate online content. Not only does it then share both links in searches if canonicalUrl is missing, but I believe it also lowers both sites as a form of penalty for seeing duplicate content on multiple sites unless canonicalUrl is there to point to source of truth