Created attachment 186399 [details] PDF with the form showing the problem. Hi, the form contains input fields for dates labeled Datum von / Datum bis (on the right hand side). If you enter an invalid date (format) - and you leave the input field with tab - the invalid input disappears. It would be nicer if okular would at least show the expected format in some way, so the user knows how to enter the date format. The pdf.js viewer in firefox shows the following message, if you enter an invalid date: "Invalid date / time: please ensure that the date / time exists. Field [ datum.bis ] should match format dd.mm.yyyy" STEPS TO REPRODUCE 1. Open attached pdf with okular 2. populate either Datum von or Datum bis with some invalid date (e.g. only characters, no numbers) 3. If you leave the input field with tab or mouse the invalid input values disappear. OBSERVED RESULT Invalid input field values disappear after input fields loses the focus. EXPECTED RESULT If the input field value in not correct, show an warning / info message, that helps the user the populate the input field (just like pdf.js in Firefox does). SOFTWARE/OS VERSIONS Linux/KDE Plasma: KDE Frameworks Version: 6.14 Qt Version: 6.9.1