https://drafts.csswg.org/css-device-adapt/#css-rule-interface has ``` partial interface CSSRule { const unsigned short VIEWPORT_RULE = 15; }; ``` https://drafts.csswg.org/css-fonts/#om-fontpalettevalues has ``` partial interface CSSRule { const unsigned short FONT_PALETTE_VALUES_RULE = 15; }; ``` They probably shouldn't both be 15. https://developer.mozilla.org/en-US/docs/Web/API/CSSRule/type says `VIEWPORT_RULE` is 15, so we should probably change `FONT_PALETTE_VALUES_RULE` to be something else. 17 seems to be unclaimed?