Tests DOMSnapshot.captureSnapshot exports layout tree nodes associated with pseudo elements.
{
    documents : [
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            baseURL : <number>
            contentHeight : 600
            contentLanguage : -1
            contentWidth : 800
            documentURL : <number>
            encodingName : 1
            frameId : <number>
            layout : {
                bounds : [
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                    ]
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                nodeIndex : [
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                ]
                stackingContexts : {
                    index : [
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                styles : [
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                text : [
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                    [21] : -1
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                    [26] : -1
                    [27] : -1
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                    [30] : -1
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                    [34] : -1
                    [35] : -1
                    [36] : 43
                    [37] : 48
                ]
            }
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                ]
                backendNodeId : <object>
                contentDocumentIndex : {
                    index : [
                    ]
                    value : [
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                }
                currentSourceURL : {
                    index : [
                    ]
                    value : [
                    ]
                }
                inputChecked : {
                    index : [
                    ]
                }
                inputValue : {
                    index : [
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                    value : [
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                }
                isClickable : {
                    index : [
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                }
                nodeName : [
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                ]
                optionSelected : {
                    index : [
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                }
                originURL : {
                    index : [
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                    value : [
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                }
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                pseudoIdentifier : {
                    index : [
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                    value : [
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                }
                pseudoType : {
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                    value : [
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                }
                shadowRootType : <object>
                textValue : {
                    index : [
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                    value : [
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                }
            }
            publicId : -1
            scrollOffsetX : 0
            scrollOffsetY : 0
            systemId : -1
            textBoxes : {
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            }
            title : -1
        }
    ]
    strings : [
        [0] :
        [1] : windows-1252
        [2] :
        [3] : #document
        [4] : HTML
        [5] : 400
        [6] : rgb(0, 0, 0)
        [7] : HEAD
        [8] : STYLE
        [9] : #text
        [10] :      p {       position: absolute;       height: 200px;       width: 200px;       font: 10px Ahem;     }     .c1::first-letter { font-weight: lighter; color: green; }     .c2::first-letter { font-weight: bold; color: blue; }     .c2::before { counter-increment: square; content: 'square: ' counter(square) url(square.png) '! '; }     ul { font: 10px Ahem; }   
        [11] :    
        [12] : SCRIPT
        [13] : src
        [14] : ../../resources/ahem.js
        [15] : BODY
        [16] :      
        [17] : P
        [18] : class
        [19] : c1
        [20] : ::first-letter
        [21] : 100
        [22] : rgb(0, 128, 0)
        [23] : I
        [24] : first-letter
        [25] : I have a first letter.
        [26] :  have a first letter.
        [27] : SPAN
        [28] : I have a first letter because of my parent.
        [29] :  have a first letter because of my parent.
        [30] : c2
        [31] : 700
        [32] : rgb(0, 0, 255)
        [33] : s
        [34] : ::before
        [35] : quare: 
        [36] : 1
        [37] : ! 
        [38] : before
        [39] : I have some content before me with a first letter.
        [40] : UL
        [41] : LI
        [42] : ::marker
        [43] : • 
        [44] : marker
        [45] : water
        [46] : malt
        [47] : hops
        [48] : yeast
        [49] :      
    ]
}