Check the support for CSS Custom Filters across browsers. The matrix below contains the features in the latest CSS Custom Filters Working Draft from the W3C.
Note: The CSS Custom Filters syntax specification has changed from an "inline" syntax to an "at-rule" syntax. The former inline syntax is deprecated and will be removed from implementations when the new at-rule syntax is fully functional. Both syntaxes expose similar functionality. The new at-rule syntax will make some additional functionality possible, such as filter margins and default values for parameters.