# UpcastMarkerFromElementCreatorFunction

typedef

[See source](https://github.com/ckeditor/ckeditor5/blob/master/packages/ckeditor5-engine/src/conversion/upcasthelpers.ts#L1223)

#### Parameters

* `viewElement: ViewElement`
* `conversionApi: UpcastConversionApi`

#### Returns

* `string`

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Full index of the CKEditor 5 API reference: [llms.txt](llms.txt)