html - javascript - why is this element non-visible on cnn.com? -

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i'm developing chrome extension highlights parts of webpages. need decide elements visible user. current filtering logic checks these properties:

visibility, opacity, getboundingclientrect dimensions.

these properties recognize cases, still find exceptions. e.g. ul element class "quick-links" on main page of cnn.com

this element has no obvious property makes invisible. why element non-visible? there way programmatically recognize scenario?

it looks quick-links container <div class="more-mega-nav"> has following properties, make children invisible user: 

.more-mega-nav {     opacity : 0;     height: 0;     overflow: hidden; }

it looks overflow: hidden deciding factor, browser clips child content extends beyond parent's width , height.


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