# Preview bug (loom, slideshare etc..)

**URL:** <https://meta.discourse.org/t/preview-bug-loom-slideshare-etc/138862>\
**Category:** UX\
**Created:** [January 16, 2020, 6:43pm UTC](https://meta.discourse.org/t/preview-bug-loom-slideshare-etc/138862 "2020-01-16T18:43:38Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![awesomerobot](https://sea3.discourse-cdn.com/meta/user_avatar/meta.discourse.org/awesomerobot/32/142900_2.png) [@awesomerobot](https://meta.discourse.org/u/awesomerobot)\
**Post date:** [January 16, 2020, 6:57pm UTC](https://meta.discourse.org/t/preview-bug-loom-slideshare-etc/138862/2 "2020-01-16T18:57:01Z")

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I don’t believe this is a bug, previously when previewing videos and other media types in the composer they’d re-render on every keystroke… so to avoid that we now use a generic placeholder instead.

[https://github.com/discourse/onebox/commit/b987f97e36843365737d9fa944ef209c607044c4](https://github.com/discourse/onebox/commit/b987f97e36843365737d9fa944ef209c607044c4)

I can see how the placeholders could be interpreted as a broken embed… I wonder if there’s something we can do to clarify…

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