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VALUES-4 defines the internal representation of `calc()` as a tree of calculation nodes. ( https://www.w3.org/TR/css-values-4/#calc-internal ) VALUES-3 lacked any definition here, so we had our own ad-hoc implementation based around the spec grammar. This commit replaces that with CalculationNodes representing each possible node in the tree. There are no intended functional changes, though we do now support nested calc() which previously did not work. For example: `width: calc( 42 * calc(3 + 7) );` I have added an example of this to our test page. A couple of the layout tests that used `calc()` now return values that are 0.5px different from before. There's no visual difference, so I have updated the tests to use the new results. |
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