Tests finding DOM nodes by computed styles traversing in-process iframes and shadow roots.
Expected nodeIds length: 2
Actual nodeIds length: 2
Nodes:
{
    node : {
        attributes : [
            [0] : class
            [1] : shadow-grid
        ]
        backendNodeId : <number>
        childNodeCount : 0
        localName : div
        nodeId : <number>
        nodeName : DIV
        nodeType : 1
        nodeValue : 
    }
}
{
    node : {
        attributes : [
            [0] : class
            [1] : iframe-grid
        ]
        backendNodeId : <number>
        childNodeCount : 0
        localName : div
        nodeId : <number>
        nodeName : DIV
        nodeType : 1
        nodeValue : 
    }
}