I suspect you have two test objects that need to be captured - one is the test object you see on screen and in the DOM. The second one is more difficult to see because the first object must be clicked to reveal the second one.
My suggestion: make the field editable (by clicking on the field) and then freeze the screen (pause all JavaScript). To do so - try this link: [How To] Use The Browser Developer Tools (F12 DevTools) - #3 by Ibus. You may then use the normal dev tools to select the element without the DOM dynamically changing and obscuring things
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