## `data-sly-attribute`

#### Expected output

    <div id="attr1" class="foo" data-number="2"></div>
    <div id="attr2" class="attrclass" data-number="1"></div>
    <div id="attr3" title="" class="attrclass" data-number="1"></div>
    <div id="attr4" class="foo"></div>
    <label><input id="attr5" type="checkbox"/>Check</label>
    <label><input id="attr6" type="checkbox" checked/>Check</label>
    <label><input id="attr7" type="checkbox"/>Check</label>
    <label><input id="attr8" type="checkbox" checked/>Check</label>
    <div id="attr14" data-attr2="false"></div>
    <div id="attr15" data-seed-slider="false"></div>
    <div id="attr16" data-seed-slider="false"></div>
    <div id="attr17" data-seed-slider="false"></div>
    <div id="attr18" data-attr2="false"></div>
    <div id="attr9" title=""></div>
    <div id="attr10" title=""></div>
    <div id="attr11" title=""></div>
    <div id="attr12" title=""></div>
    <div id="attr13" class="foo" data-number="2" title=""></div>

Check Check Check Check
foo foo foo