Docs / Content
ContentImageByKey is an AMPscript function in the content category. Same fallback behavior.
ContentImageByKey(key, [defaultUrl])
<img src="%%=ContentImageByKey("hero", "https://placehold.co/600x200")=%%" alt="hero">
<img src="https://placehold.co/600x200" alt="hero">
Output produced by AmpSend's AMPscript engine (validated against Salesforce's own test corpus) - not a hand-written result.
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ContentImageByKey in the official AMPscript reference - or browse the official index of AMPscript functions for platform behavior and edge cases.