The tables in Wikipedia does not allow Conditional Formatting as of now. It would be really helpful if a conditional formatting feature like in MS Excel is introduced for wikitables. This would reduce the requirement of repeating templates like {{party shading/Republican}} and {{party shading/Democratic}} over and over again, vastly reducing the size of the article. It will also reduce the chance of committing mistakes when manually edited, which sometimes do happen due to the vast number of cells which may require editing.
For example, in tables such as the one in https://en.wikipedia.org/wiki/Cook_Partisan_Voting_Index#By_congressional_district we have to use the party shading templates at least 870 times, (the complete article has 81,057 bytes). Much of that bytes, time, and effort put into making the list could simply be saved if we can use conditional formatting. A smaller article will also make it easier to load in places of low internet connectivity.
Similarly, in articles such as https://en.wikipedia.org/wiki/Template:Biden_confirmations we can fix the colors for Yea, Nay, and No Vote beforehand to reduce the chance of committing mistakes and again reducing the size of the article.
Thanks!