J'ai essayé sur une page wordpress, aucun soucis elle s'affiche. Par contre sur une page personnalisé rien ne s'affiche. j'ai testé avec Textfield, Embed et WYSIWYG rien ne fonctionne.
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So, you want to dynamically insert an iframe into a template rather than a page, where the iframe code is stored in a custom field?
That isn't possible directly, but there is a workaround, where you use a custom field to store the value for the src attribute of the iframe and then construct the iframe element dynamically, using a shortcode to provide the value for the src attribute from the custom field.
Assuming you are using the block editor you could use a Custom HTML block or Fields and Text block in HTML mode.
Assuming that you have a custom field "iframe-src" that stores the url, your HTML would look something like