376294 - Reload button does not clear data set with document.form.<hidden input>.value='New value'

Status: RESOLVED DUPLICATE of bug 235929

(Core :: DOM: Core & HTML, defect)

Description

[Duncan Loveday]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9a4pre) Gecko/20070331 Minefield/3.0a4pre
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9a4pre) Gecko/20070331 Minefield/3.0a4pre

Given an HTML <form> containing <input name="hiddenInput" type="hidden" value="Initial value">, if the value is updated from a script using document.form.hiddenInput.value='New value' then the value set persists even after the page is reloaded. In contrast, if the value is updated from a script using document.form.hiddenInput.setAttribute('value', 'New value') then the value set is reset when the page is reloaded.

Reproducible: Always

Steps to Reproduce:
1. Open the attached HTML test case.
2. Click the buttons to read the data using document.form.hiddenInput.value and/or document.form.hiddenInput.getAttribute('value').
3. Click the button to set a new value using document.form.hiddenInput.setAttribute('value', 'New value'). Repeat step 2.
4. Click the reload button and repeat step 2.
5. Repeat steps 3 and 4 but this time click the button to set a new value using document.form.hiddenInput.value='New value'..
Actual Results:  
The first time step 2 is performed, an initial value is displayed.
In step 3, a new value is displayed.
In step 4, the initial value is reinstated after the reload button is clicked.
In step 5, a new value is displayed but is NOT reinstated when the reload button is clicked.

Expected Results:  
Clicking the reload button should revert all changes made to the page by scripts, so in step 5 the value should revert to the initial value when the reload button is clicked.

Comment 1

[Duncan Loveday]

Attachment: test HTML source

Comment 2

[Duncan Loveday]

Not sure this is really form submission as such but couldn't find a better home for it.