User guide - Confluence
Viewing fields
A popup will show if you hover a URL of an issue for more than 0.5 seconds. After leaving the popup, it will disappear in a short time.
The hover is scroll-able and re-sizeable, so you can view as many fields as you want.
This functionality is enabled in Confluence pages, blog posts, comments and more.
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Issue previews are possible in Jira and Bamboo also! See Issue Preview for Jira user guide and Issue Preview for Bamboo user guide