OptionalheadlineOptionalhtmlA message rendered as HTML. Takes precedence over message when set.
A string value is sanitized before rendering, so scripts and event handlers are stripped.
A TemplateResult is rendered as-is — Lit escapes its bindings, so it is safe by construction
unless you explicitly opt out with unsafeHTML.
Do not interpolate user-controlled content into an HTML string: sanitization prevents script execution but not markup injection (e.g. links or images).
The notification message, rendered as plain text. Use UmbNotificationDefaultData.htmlMessage to render HTML.
OptionalstructuredUse UmbPeekErrorArgs instead. Scheduled for removal in Umbraco 19.
Optionalwhitespace
The default data of notifications UmbNotificationDefaultData