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LibWeb: Add and use the "snap a length as a border width" algorithm
Previously, we always rounded border-widths up when converting them to device pixels. However, the spec asks us to follow a specific algorithm to "snap" these values, so that the computed value is snapped. The difference from before, is that widths of between 0 and 1 device pixels are rounded up to 1, and and values larger than 1 are rounded down.
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<style>
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div {
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width: 100px;
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height: 100px;
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}
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/* Both of these border-widths should snap to 1px. */
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.a {
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border: 1.8px solid black;
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}
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.b {
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border: 0.2px solid black;
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}
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</style><div class="a"></div><div class="b"></div>
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