2.2.49 [HTML] Section 17.13.2, Successful controls

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C0048:

The specification states:

 The current value of a file select is a list of one or more file names. Upon 
 submission of the form, the contents of each file are submitted with the rest of 
 the form data. The file contents are packaged according to the form's content type.

All Document Modes (All Versions)

Form content type = multipart/form-data is supported. Only one file per file select control is supported.

V0119:

The specification states:

 The current value of an object control is determined by the object's 
 implementation.

Quirks Mode, IE7 Mode, and IE8 Mode (All Versions)

Determining the current value of an object control by the object’s implementation is not supported. Instead, [object] is submitted as the value of the submitted OBJECT element.

IE9 Mode (All Versions)

Nothing is submitted as the current value of a submitted OBJECT element.

C0049:

The specification states:

 If a control doesn't have a current value when the form is submitted, user agents 
 are not required to treat it as a successful control.

All Document Modes (All Versions)

Even if a control does not have a current value specified, the control is treated as successful, and submission of the control occurs when the form is submitted.