# Link preview not working for specific site

**URL:** https://meta.discourse.org/t/link-preview-not-working-for-specific-site/135568
**Category:** Support
**Created:** [December 10, 2019, 3:00pm UTC](https://meta.discourse.org/t/link-preview-not-working-for-specific-site/135568 "2019-12-10T15:00:13Z")
**Posts on this page:** 1
**Showing post:** 5

<div class="post-metadata">

### Author: ![JimPas](https://sea3.discourse-cdn.com/meta/user_avatar/meta.discourse.org/jimpas/32/148179_2.png) [@JimPas](https://meta.discourse.org/u/JimPas)
#### Post date: [December 11, 2019, 4:46am UTC](https://meta.discourse.org/t/link-preview-not-working-for-specific-site/135568/5 "2019-12-11T04:46:43Z")

</div>

[onebox](https://github.com/discourse/onebox) visits the destination page and checks for [Open Graph](http://ogp.me/) or [oEmbed](https://oembed.com/) tags, including:

- site address
- title
- feature image
- description (mandatory)
- product price

> ⚠ Please note that Discourse _does_ require the description tag to be present and contain enough text to summarize the page, or the target link will not onebox.

Another good explanation is at [Creating rich link previews with Onebox](https://meta.discourse.org/t/rich-link-previews-with-onebox/98088).

### Advanced iFrames

By default `<iframe>` is blocked for security reasons, but if they are from a highly trusted source, a Discourse admin can explicitly whitelist that domain as an `<iframe>` target in the site settings.

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_[View the full topic](https://meta.discourse.org/t/link-preview-not-working-for-specific-site/135568)._