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dabblet.css

span {
   display: none;
}

#toggle-1:checked ~ [class=appendDataCheckbox]{
    display: inline;
}

dabblet.html

<input type="checkbox" id="toggle-1">
<span class="appendDataCheckbox"><label for="toggle-2">Append Data? </label><input id="toggle-2" type="checkbox"></input></span>

settings.json

{"view":"split-vertical","fontsize":"70","seethrough":"","prefixfree":"1","page":"all"}