Rule 110 in CSS

Turing-completeness of CSS.

by Camilo

HTML

<p><a href="http://en.wikipedia.org/wiki/Rule_110">Rule 110</a> in (webkit) CSS, proving Turing-completeness.</p>

<!-- A total of 900 checkboxes required -->
<input type="checkbox" />
<input type="checkbox" />
<input type="checkbox" />
<input type="checkbox" />
<input type="checkbox" />
<input type="checkbox" />
<input type="checkbox" />
<input type="checkbox" />
<input type="checkbox" />
<input type="checkbox" />
<input type="checkbox" />
<input type="checkbox" />
<input type="checkbox" />
<input type="checkbox" />
<input type="checkbox" />
<input type="checkbox" />
<input type="checkbox" />
<input type="checkbox" />
<input type="checkbox" />
<input type="checkbox" />
<input type="checkbox" />
<input type="checkbox" />
<input type="checkbox" />
<input type="checkbox" />
<input type="checkbox" />
<input type="checkbox" />
<input type="checkbox" />
<input type="checkbox" />
<input type="checkbox" />
<input type="checkbox" />
<input type="checkbox" />
<input type="checkbox" />
<input type="checkbox" />
<input type="checkbox" />
<input type="checkbox" />
<input type="checkbox" />
<input type="checkbox" />
<input type="checkbox" />
<input type="checkbox" />
<input type="checkbox" />
<input type="checkbox" />
<input type="checkbox" />
<input type="checkbox" />
<input type="checkbox" />
<input type="checkbox" />
<input type="checkbox" />
<input type="checkbox" />
<input type="checkbox" />
<input type="checkbox" />
<input type="checkbox" />
<input type="checkbox" />
<input type="checkbox" />
<input type="checkbox" />
<input type="checkbox" />
<input type="checkbox" />
<input type="checkbox" />
<input type="checkbox" />
<input type="checkbox" />
<input type="checkbox" />
<input type="checkbox" />
<input type="checkbox" />
<input type="checkbox" />
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<input type="checkbox" />
<input type="checkbox" />
<input...

CSS

body {
    -webkit-animation: bugfix infinite 1s;
    margin: 0.5em 1em;
}
@-webkit-keyframes bugfix { from { padding: 0; } to { padding: 0; } }

/*
 * 111 110 101 100 011 010 001 000
 *  0   1   1   0   1   1   1   0
 */

body > input {
    -webkit-appearance: none;
    display: block;
    float: left;
    border-right: 1px solid #ddd;
    border-bottom: 1px solid #ddd;
    padding: 0px 3px;
    margin: 0;
    font-family: Consolas, "Courier New", monospace;
    font-size: 7pt;
}
body > input::before {
    content: "0";
}

p {
    font-family: Verdana, sans-serif;
    font-size: 9pt;
    margin-bottom: 0.5em;
}

body > input:nth-of-type(-n+30) { border-top: 1px solid #ddd; }
body > input:nth-of-type(30n+1) { border-left: 1px solid #ddd; clear: left; }

body > input::before { content: "0"; }

body > input:checked::before { content: "1"; }
body > input:checked { background: #afa !important; }


input:not(:checked) +
        *+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+
        input::before {
    content: "1";
}
input:not(:checked) +
        *+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+
        input {
    background: #fa0;
}


input:checked +
        *+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+
        input::before {
    content: "1";
}
input:checked +
        *+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+
        input {
    background: #fa0;
}


input:checked +
        *+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+
        input::before {
    content: "1";
}
input:checked +
        *+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+
        input {
    background: #fa0;
}

input:checked + input:checked + input:checked +
        *+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+
        input::before {
    content: "0";
}
input:checked + input:checked + input:checked +
        *+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+
        input {
    background:...