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Add example of normalizing N-ary operators #532

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Jan 28, 2018
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Add example of normalizing N-ary operators #532

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27 changes: 27 additions & 0 deletions css-typed-om/Overview.bs
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Original file line number Diff line number Diff line change
Expand Up @@ -2535,6 +2535,33 @@ CSS <<number>>, <<percentage>>, and <<dimension>> values become {{CSSNumericValu
</pre>
</div>

<div class=example>
Note that addition and multiplication are N-ary,
so ''calc(1px + 2px + 3px)''
produces the structure:

<pre>
CSSMathSum(
CSS.px(1),
CSS.px(2),
CSS.px(3)
)
</pre>

but ''calc(calc(1px + 2px) + 3px)''
produces the structure:

<pre>
CSSMathSum(
CSSMathSum(
CSS.px(1),
CSS.px(2)
),
CSS.px(3)
)
</pre>
</div>

Note: The value computation process may transform different units into identical ones,
simplifying the resulting expression.
For example, ''calc(1px + 2em)'' as a specified value
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