How to have user form fills persist on the same session?

[mwmarketing]

We're having an issue where users will fill out a form on our website. Go back click around to a different piece of content or Marketo form on our website. The Marketo form won't remember their inputted information from a minute ago. Are their any pieces of simple code I can place into our HTML landing page template or WordPress CMS to have this work as before pre 2018? 

Is it just  matter of switching this setting on the form to the Custom HTML toggle and the form will give a button choice to present the asset?

I found this article on the topic:

https://nation.marketo.com/t5/product-discussions/form-prefill-not-working/td-p/301300 

https://nation.marketo.com/t5/knowledgebasebackup/browser-cookie-updates-how-marketo-munchkin-is-aff...

[SanfordWhiteman]

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The Marketo form won't remember their inputted information from a minute ago. Are their any pieces of simple code I can place into our HTML landing page template or WordPress CMS to have this work as before pre 2018? 

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Simple? No, because to do it correctly is complex. But there is code: my Cross-Domain Pre-Fill JS works on Marketo Landing Pages as well, it doesn’t have to be cross-domain.

However, if you don’t want to show them a form, just a button, then you don’t need Pre-Fill at all. You just need Known Visitor HTML, which you mentioned.