[Webkit-unassigned] [Bug 165303] New: AX: aria-live property is ignored when value is computed from form input

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=165303

            Bug ID: 165303
           Summary: AX: aria-live property is ignored when value is
                    computed from form input
    Classification: Unclassified
           Product: WebKit
           Version: Safari 10
          Hardware: All
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Accessibility
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: code at sylvaingamel.fr
                CC: webkit-bug-importer at group.apple.com

**Context:**

This issue was detected when implementing a double entry slider.

Some sub-total pricing values are computed depending on 2 values entered by user in two inputs.
User is supposed to be alerted that computed subtotals are getting updated with new values.

Implemented markup:

- 2 input for user.
- 2 `var` element reflecting the values computed from the changed values.
- 2 `p` element containing some description text and those 2 vars.

`p` elements are defined as `aria-atomic=true` and `aria-live=polite`.


**Expected behavior:**

When input is updated, the two `p` are read again to give user the newly computed values.

**Observed result:**

When an input value is updated only the new value is read. 
The two computed values are never read.


**Example:**

A full simplified example is available as a jsFiddle here: https://jsfiddle.net/sgamel/upgp8qoo/

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