1.1 --- a/css-overflow/Overview.bs Wed Apr 29 21:56:47 2015 +0200
1.2 +++ b/css-overflow/Overview.bs Thu Apr 30 00:19:39 2015 +0200
1.3 @@ -377,7 +377,7 @@
1.4
1.5 <pre class=propdef>
1.6 Name: overflow-x, overflow-y
1.7 - Value: ''visible'' | ''hidden'' | ''scroll'' | ''auto''
1.8 + Value: ''visible'' | ''hidden'' | ''clipped'' | ''scroll'' | ''auto''
1.9 Initial: ''visible''
1.10 Applies to: block containers [[!CSS21]], flex containers [[!CSS3-FLEXBOX]], and grid containers [[!CSS3-GRID-LAYOUT]]
1.11 Inherited: no
1.12 @@ -396,7 +396,7 @@
1.13
1.14 <pre class=propdef>
1.15 Name: overflow
1.16 - Value: ''visible'' | ''hidden'' | ''scroll'' | ''auto''
1.17 + Value: ''visible'' | ''hidden'' | ''clipped'' | ''scroll'' | ''auto''
1.18 Initial: see individual properties
1.19 Applies to: block containers [[!CSS21]], flex containers [[!CSS3-FLEXBOX]], and grid containers [[!CSS3-GRID-LAYOUT]]
1.20 Inherited: no
1.21 @@ -434,15 +434,66 @@
1.22 may be rendered outside the block container.
1.23 </dd>
1.24 <dt><dfn>hidden</dfn>
1.25 + <dd>This value indicates that
1.26 + the content is clipped and that no scrolling user interface should be provided by the UA
1.27 + to view the content outside the clipping region.
1.28 + However, the content may still be scrolled programatically,
1.29 + for example using the mechanisms defined in [[CSSOM-VIEW]].
1.30 + <dt><dfn>clipped</dfn>
1.31 + <dd>Like ''hidden'',
1.32 + this value indicates that
1.33 + the content is clipped
1.34 + and that no scrolling user interface should be provided by the UA
1.35 + to view the content outside the clipping region.
1.36 + In addition, unlike ''overflow: hidden''
1.37 + which still allows programmatic scrolling,
1.38 + ''overflow: clipped'' forbids scrolling entirely,
1.39 + through any mechanism.
1.40 +
1.41 + Issue: Mozilla implements -moz-hidden-unscrollable,
1.42 + which is similar to ''clipped'',
1.43 + except that it does not cause the element to establish a BFC.
1.44 + Should we match that?
1.45 <dt><dfn>scroll</dfn>
1.46 + <dd>This value indicates that the content is clipped
1.47 + and that if the user agent uses a scrolling mechanism
1.48 + that is visible on the screen (such as a scroll bar or a panner),
1.49 + that mechanism should be displayed for a box
1.50 + whether or not any of its content is clipped.
1.51 + This avoids any problem with scrollbars appearing
1.52 + and disappearing in a dynamic environment.
1.53 + When this value is specified and the target medium is ''print'',
1.54 + overflowing content may be printed.
1.55 <dt><dfn>auto</dfn>
1.56 - <dd>
1.57 - <p class="issue">
1.58 - Move material from [[CSS21]] and [[CSS3BOX]] here.
1.59 - </p>
1.60 - </dd>
1.61 + <dd>The behavior of the ''overflow/auto'' value is user agent-dependent,
1.62 + but should cause a scrolling mechanism to be provided for overflowing boxes.
1.63 </dl>
1.64
1.65 + Even if 'overflow' is set to ''overflow/visible'',
1.66 + content may be clipped to a UA's document window by the native operating environment.
1.67 +
1.68 + If the computed value of 'overflow' is not ''overflow/visible'',
1.69 + the element creates a block formatting context.
1.70 +
1.71 + UAs must apply the 'overflow' property
1.72 + set on the root element to the viewport.
1.73 + HTML UAs must instead apply the ‘overflow’ property
1.74 + from the <{body}> element to the viewport
1.75 + if the value on the root element is ''visible''.
1.76 + The ''visible'' value when used for the viewport
1.77 + must be interpreted as ''overflow/auto''.
1.78 + The element from which the value is propagated
1.79 + must have a used value for 'overflow' of ''visible''.
1.80 +
1.81 + In the case of a scrollbar being placed on an edge of the element's box,
1.82 + it should be inserted between the inner border edge
1.83 + and the outer padding edge.
1.84 + Any space taken up by the scrollbars should be
1.85 + taken out of (subtracted from the dimensions of)
1.86 + the containing block formed by the element with the scrollbars.
1.87 +
1.88 + Issue: import examples from [[CSS3-BOX]].
1.89 +
1.90 <p class="issue">
1.91 Explain which directions allow scrolling and which don't,
1.92 as a function of 'direction'
