If you are importing a custom HTML template, or building your own custom coded template, there are a few things to consider.
Klaviyo Does Not Support Embedded Forms or Videos
Learn moreIf you're interested in learning workarounds for this, check out this article.
Custom HTML and CSS Elements
Certain HTML and CSS elements used to make emails interactive are not currently supported. For example, if you are looking to make your email interactive in Gmail by using certain CSS attribute selectors, you may see your template trigger an error in Klaviyo.
Klaviyo does not currently support certain operators (like ~) in email templates. This may limit the extent to which certain custom HTML and CSS can be used. If your template contains HTML or CSS that isn't fully supported, you will not be able to generate a preview of your email and will see the following error: