Hi Tab, My use case can already be implemented using JavaScript and some existing properties on elements such as clientLeft and its cousins.
Here's a simplified version of my use case: http://codepen.io/behrangsa/pen/PPozWj But I thought it would be nicer if an element had a method that could be used in such cases. Regarding what to do with partially visible elements, rather than returning true/false, the method/property -- for example visibleRect -- can return the dimensions of the visible part of the element (e.g. x: 0, y: 0, w: 20, h:10) or (0,0,0,0) if it is not visible at all. I am not sure if this is technically feasible or not. But AFAIK some games use various algorithms to determine the visibility of an object in a 3D space. Or if a bullet fired in a direction will hit a given object or it will get blocked by an obstacle in front of it. So it seemed to me it probably should be feasible in HTML/CSS as well. On Thu, Sep 3, 2015 at 8:42 AM Tab Atkins Jr. <[email protected]> wrote: > On Tue, Aug 25, 2015 at 6:39 PM, Behrang Saeedzadeh <[email protected]> > wrote: > > Looks like at the moment DOM does not expose any properties that signify > > whether an element has become hidden due to an overflow: hidden on their > > parent element. > > > > Any chance of adding this feature to DOM? > > That's a result of CSS layout/rendering; it doesn't seem > super-appropriate to add to the DOM. It's also a bit troublesome; an > element can be partially hidden, so when does this flag flip to true? > It's also very specific; there are a ton of ways that an element can > get hidden besides being clipped by an overflow:hidden ancestor. > What's the actual use-case you're trying to address here? > > ~TJ > -- Best regards, Behrang Saeedzadeh
_______________________________________________ es-discuss mailing list [email protected] https://mail.mozilla.org/listinfo/es-discuss
