SWI-Prolog -- get_style/3

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Predicate get_style/3

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Source

[semidet]get_style(+Elem, +Attr, =Value)

True when Value is the computed value for the given style attribute. If the computed style is undefined, Value is unified to the element style. The DOM style string is translated into a Prolog term according to these rules:

px(N) maps to Npx
’%’(N) maps to N%
url(URL) maps to url("URL")
rgb(R,G,B) maps to rgb(R,G,B)