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Dec 7, 2022
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[scroll-animations-1] Define view() notation #7587 #7988

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26 changes: 24 additions & 2 deletions scroll-animations-1/Overview.bs
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Expand Up @@ -342,8 +342,9 @@ spec: cssom-view-1; type: dfn;
at the start edge of the [=scrollable overflow rectangle=],
it might not be possible to scroll to < 32% progress.

[=View progress timelines=] can be referenced in 'animation-timeline' by name
(see [[#timeline-scope]])
[=View progress timelines=] can be referenced
anonymously using the ''view()'' [=functional notation=]
or by name (see [[#timeline-scope]])
after declaring them using the 'view-timeline' properties
on the view progress subject.
In the Web Animations API,
Expand Down Expand Up @@ -404,6 +405,27 @@ spec: cssom-view-1; type: dfn;

## Anonymous View Progress Timelines ## {#view-timelines-anonymous}

### The ''view()'' notation ### {#view-notation}

The <dfn>view()</dfn> functional notation
can be used as a value of 'animation-timeline'
and specifies a [=view progress timeline=]
in reference to the nearest ancestor [=scroll container=].
Its syntax is

<pre class="prod">
<<view()>> = view( [ <<axis>> || <<'view-timeline-inset'>> ]? )
</pre>

By default,
''view()'' references the [=block axis=];
as for ''scroll()'',
this can be changed by providing an explicit <<axis>> value.

The optional <<'view-timeline-inset'>> value provides an adjustment
of the [=view progress visibility range=],
as defined for 'view-timeline-inset'.

### The {{ViewTimeline}} Interface ### {#viewtimeline-interface}

<pre class="idl">
Expand Down