When validating forms with Parsley.js, trix's link url validation is triggered and the form does not submit.
It seems that Parsley differs from the HTML5 constraints spec in regard to disabled inputs, which are normally excluded from validation.

(true means valid)
Parsley's documentation highlights excluding disabled inputs using a data-parsley-excluded attribute: http://parsleyjs.org/doc/index.html#psly-usage-form
I've confirmed this works and prevents validating Trix's URL input:
<form data-parsley-validate data-parsley-excluded="[disabled]">
<trix-editor></trix-editor>
<input type="submit">
</form>
Most helpful comment
It seems that Parsley differs from the HTML5 constraints spec in regard to
disabledinputs, which are normally excluded from validation.(true means valid)
Parsley's documentation highlights excluding
disabledinputs using adata-parsley-excludedattribute: http://parsleyjs.org/doc/index.html#psly-usage-formI've confirmed this works and prevents validating Trix's URL input: