This is a page from the Cascading Style Sheets Working Group Blog. Some other places to find information are the “current work” page, the www-style mailing list, the Future of CSS syndicator, and the issue list on Github.
Do you want to know how the CSS WG works? Fantasai has written about:csswg, An Inside View of the CSS Working Group at W3C.
line-height-step property would lead to an author accidentally getting the double height in a browser he/she didn’t test against due to a variation on the value of line-height:normal caused by each browser calculating it slightly differently.
line-height:normal is a TBD fixed value when the user sets line-height-step to anything other than initial. If this proposal does go forward the initial value of line-height-step should be none.line-height:normal suddenly stops working.background-repeat-x/y due to web usage several browser vendors didn’t want to add the property because they didn’t feel there was such a strong need. It is Chrome’s responsibility to gather more data to either persuade other vendors to implement it or to decide that they can remove it.background-repeat-x/y for now