Investigate HTMLRenderLayerNavigation behavior with zero size elements

[williamw2]

Description

The Fluent Dialog component is composed of a zero height parent element with "position:fixed" children. When the dialog component is selected this results in the highlighted region being a single line and not highlighting all of the child elements.

Investigate with Chris Holt if this is the intended behavior of the Fluent Dialog component and see if there is a better way for the Navigation component to handle similar scenarios.

[williamw2]

This is a symptom of a larger question: How to represent the position of elements that are not visible? This applies to components with a zero-size parent that is positioning child elements (Fluent Dialog) as well as parents with hidden children (highlighting an tag inside a collapsed ) or even an element with the style "display:none". Each of theses scenarios could have their own possible solutions but we need to decide on a design philosophy for them before the technical solutions can be explored.

Closing this issue and opening new issues to address the root question.

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