[css-overflow-3][css-images-4] Remove object-overflow and define overflow on replaced elements. w3c#7144

Author: tabatkins

css-images-4/Overview.bs

@@ -2110,54 +2110,6 @@ Sizing Objects: the 'object-fit' property {#the-object-fit}
 	and then uses the values of several attributes on the root <code>&lt;svg></code> element to determine how to draw itself.
 
 
-Overflowing Objects: the 'object-overflow' property {#the-object-overflow}
---------------------------------------------------------------------------
-
-	<pre class=propdef>
-	Name: object-overflow
-	Value: clip | visible
-	Initial: clip
-	Applies to: replaced elements
-	Inherited: no
-	Percentages: n/a
-	Computed value: as specified
-	Animation type: discrete
-	</pre>
-
-	The 'object-overflow' property specifies
-	how replaced elements render any content
-	that overflows their [=content box=].
-
-	<dl dfn-type=value dfn-for=object-overflow>
-		: <dfn>clip</dfn>
-		:: The box's content is clipped to its [=content box=],
-			and the UA must not allow the content to be scrolled by any means
-			to display the overflowing content.
-
-			Note: Replaced elements can render their contents in any way they wish;
-			for example, the content <em>itself</em> might be scrollable
-			and provide scrollbars and similar affordances,
-			such as the contents of an HTML <{iframe}> element.
-			But if that content rectangle overflows the content box
-			of the element,
-			<em>it</em> must not expose the overflowing parts of itself
-			in any way.
-
-		: <dfn>visible</dfn>
-		:: There is no special handling of overflow;
-			that is, the box’s content is rendered outside the box
-			if positioned there.
-			The box is not a [=scroll container=].
-
-			Any content that as a result
-			is rendered outside of the [=content box=]
-			is treated as [=ink overflow=].
-	</dl>
-
-	<div class=example>
-		Issue: example here, showing a combo with object-view-box to get an image of something with a built-in shadow to render the shadow outside of the box.
-	</div>
-
 
 
 Image Processing {#image-processing}

css-overflow-3/Overview.bs

@@ -337,10 +337,10 @@ Scrolling and Clipping Overflow: the 'overflow-x', 'overflow-y', and 'overflow'
 		Name: overflow-x, overflow-y
 		Value: visible | hidden | clip | scroll | auto
 		Initial: ''visible''
-		Applies to: block containers [[!CSS2]], flex containers [[!CSS3-FLEXBOX]], and grid containers [[!CSS3-GRID-LAYOUT]]
+		Applies to: block containers [[!CSS2]], flex containers [[!CSS3-FLEXBOX]], grid containers [[!CSS3-GRID-LAYOUT]], and [=replaced=] elements
 		Inherited: no
 		Percentages: N/A
-		Computed value: as specified, except with ''visible''/''clip'' computing to ''overflow/auto''/''hidden'' (respectively) if one of 'overflow-x' or 'overflow-y' is neither ''visible'' nor ''clip''
+		Computed value: usually specified value, but see text
 		Animation type: discrete
 	</pre>
 
@@ -375,6 +375,11 @@ Scrolling and Clipping Overflow: the 'overflow-x', 'overflow-y', and 'overflow'
 			the box’s content is rendered outside the box if positioned there.
 			The box is not a <a>scroll container</a>.
 
+			If the element is [=replaced=],
+			any overflow is [=ink overflow=].
+			(Otherwise, it might be [=ink overflow=] or [=scrollable overflow=],
+			depending on what precisely is overflowing.)
+
 		<dt><dfn>hidden</dfn>
 		<dd>
 			This value indicates that
@@ -432,6 +437,15 @@ Scrolling and Clipping Overflow: the 'overflow-x', 'overflow-y', and 'overflow'
 			if there is overflow.
 		</dl>
 
+	On non-[=replaced=] elements,
+	the  ''visible''/''overflow/clip'' values of 'overflow'
+	compute to ''overflow/auto''/''hidden'' (respectively)
+	if one of 'overflow-x' or 'overflow-y' is neither ''visible'' nor ''overflow/clip''.
+
+	On [=replaced elements=],
+	all values other than ''visible''
+	compute to ''overflow/clip''.
+
 	If the computed value of 'overflow' on a <a>block box</a>
 	is neither ''overflow/visible'' nor ''overflow/clip'' nor a combination thereof,
 	it [=establishes an independent formatting context=] for its contents.
@@ -440,6 +454,7 @@ Scrolling and Clipping Overflow: the 'overflow-x', 'overflow-y', and 'overflow'
 	(or ''visibility/collapse'' when it has the same effect as ''visibility/hidden''),
 	and 'overflow' is either ''overflow/scroll'' or ''overflow/auto'',
 	then:
+
 	* The user agent must not make any scrolling mechanism visible.
 		To the extent that the scrolling mechanism that would normally be visible
 		in the absence of ''visibility: hidden'' affects layout,
@@ -614,7 +629,10 @@ Expanding Clipping Bounds: the 'overflow-clip-margin' property</h3>
 		::
 			Specifies the box edge to use as the [=overflow clip edge=] origin,
 			i.e. when the specified offset is zero.
-			Defaults to ''overflow-clip-margin/padding-box'' if omitted.
+
+			If omitted,
+			defaults to ''overflow-clip-margin/padding-box'' on non-[=replaced=] elements,
+			or ''overflow-clip/content-box'' on [=replaced=] elements.
 
 		: <dfn><<length [0,∞]>></dfn>
 		::