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        <title class="a b">Testing of DOMTokenList iterable capacities</title>
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        <script>
            description('Testing of DOMTokenList iterable capacities.');

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            function createIterable(items) {
                items.push(classList[0]);
                items.push(classList[1]);
                return classList;
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            function updateIterable() {
                testingGround.setAttribute("class", "a b c d");
            }
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