SVG:Pointer-events: Difference between revisions

One of the long running debates in the SVG WG and on www-svg is whether clipping and masking should affect pointer event targeting (hit testing). Current (2010) implementations do not take masking into account for hit testing, but Mozilla and Opera do take clipping into account, whereas Webkit and Batik do not. My (jwatt's) personal opinion is that it's most intuitive for authors to have both clipping and masking affect hit testing by default. In fact I think it would be best for the principle to be that the default behavior is: "if an element affects a given pixel, then a pointer event occurring at that pixel may target the element, but if the element does not affect the pixel, then the pointer event will not target the element."

Text should be a special case, by default. In the typical case where text is displayed at normal reading size, when a user wishes to click on it to activate a link, or perhaps to select it, it would be unexpected and annoying for the pointer event to go "through" and target whatever is underneath if the click happened to be between two letters, or in the inside of an "o", say. For text, having the character cell respond to pointer events is a better default.