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Doc tweaks.

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Mark Otto 2019-10-19 08:32:29 +03:00 committed by XhmikosR
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site/content/docs/4.3/getting-started/theming.md
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@ -215,9 +215,9 @@ You can also specify a base color with our color map functions:
We use the `escape-svg` function to escape the `<`, `>` and `#` characters for SVG background images. These characters need to be escaped to properly render the background images in IE.
## Add and Subtract function
## Add and Subtract functions
We use the `add` and `subtract` functions instead of the CSS `calc` function. The primary purpose of these functions is to avoid errors when "unitless" 0 is given to the `calc` expression.
We use the `add` and `subtract` functions to wrap the CSS `calc` function. The primary purpose of these functions is to avoid errors when a "unitless" `0` value is passed into a `calc` expression. Expressions like `calc(10px - 0)` will return an error in all browsers, despite being mathematically correct.
Example where the calc is valid: