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This is a preperation change to upgrade to polymer 2.x. See [1] Also use getComputedStyleValue where possible to get the value customStyle also had the ability to get the value, but in polymer 2.x the only way possible is to use getComputedStyleValue. Also when updating to polymer 2.x we need to update getComputedStyleValue syntax to match [1] which is not possible in polymer 1.x. [1] https://www.polymer-project.org/2.0/docs/upgrade#use-updatestyles-instead-of-customstyle Change-Id: I7b4139f7eeddb4d7d5da3f518e950a8fd0e2f4f7