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Atoms contain much more complicated algorithm - see "javascript/atoms/dom.js#bot.dom.getEffectiveStyle". For example: * color values are standardized * getCascadedStyle_ is invoked during the algorithm
Color must be standardised - https://dvcs.w3.org/hg/webdriver/rev/f76fbf1117c4
getCascadedStyle_ in the algorithm is to handle legacy IE. Since the spec is future facing I am closing this bug