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[css-grid] Resolved values of grid-template-rows/columns don't round-trip · Issue #4475 · w3c/csswg-drafts · GitHub
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Description
According to @fantasai in #4444 (comment),
Roundtripping getComputedStyle() values is probably the most fundamental rule about defining them.
However, grid-template-rows and grid-template-columns don't always round-trip. That's because they set explicit tracks, which start just after the 1st grid line. However, when serialized, they also include implicit tracks, which may exist before the 1st grid line.
gridContainer.style.gridAutoRows = "1px";
gridContainer.style.gridTemplateRows = "2px";
var cs = getComputedStyle(gridContainer);
cs.gridTemplateRows; // "2px"
gridItem.style.gridRow = "auto / 1";
gridContainer.style.gridTemplateRows = cs.gridTemplateRows; // "1px 2px"
gridContainer.style.gridTemplateRows = cs.gridTemplateRows; // "1px 1px 2px"
gridContainer.style.gridTemplateRows = cs.gridTemplateRows; // "1px 1px 1px 2px"
gridContainer.style.gridTemplateRows = cs.gridTemplateRows; // "1px 1px 1px 1px 2px"On the one hand, knowing the final size of these implicit tracks can be useful. On the other hand, failing to round-trip sucks.
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