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Is it legal to have an HTML form with more than one "hidden" control element with the same name? I expect to get the values of all of these elements at the server. If it is legal, do the major browsers implement the behavior correctly?
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Yes. Show activity on this post.
Only the name must be unique inside the form itself. See the docs: "The value must not be the empty string, and the value must be unique amongst the form elements in the forms collection that it is in, if any." This may be misleading.
The <input type="hidden"> defines a hidden input field. A hidden field let web developers include data that cannot be seen or modified by users when a form is submitted. A hidden field often stores what database record that needs to be updated when the form is submitted.
The browsers are OK with it. However, how the application library parses it may vary.
Programs are supposed to group identically named items together. While the HTML specification doesn't explicitly say this, it is implicitly stated in the documentation on checkboxes:
Several checkboxes in a form may share the same control name. Thus, for example, checkboxes allow users to select several values for the same property.
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