t <- theme_grey()
calc_element('text', t)
# Compare the "raw" element definition to the element with calculated inheritance
t$axis.text.x
calc_element('axis.text.x', t, verbose = TRUE)
# This reports that axis.text.x inherits from axis.text,
# which inherits from text. You can view each of them with:
t$axis.text.x
t$axis.text
t$text
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