Re: [csswg-drafts] [scroll-animations-1] ViewTimeline values of startOffset/endOffset in RTL writing mode (#7752)

The CSS Working Group just discussed `[scroll-animations-1] ViewTimeline values of startOffset/endOffset in RTL writing mode`, and agreed to the following:

* `RESOLVED: SLA uses logical interpretations of scrolling (rather than scrollLeft/Top always)`

<details><summary>The full IRC log of that discussion</summary>
&lt;fantasai> s/Topic/Subtopic/<br>
&lt;TabAtkins> flackr: on SL timelines we have start-offset and end-offset giving resolved scroll position<br>
&lt;TabAtkins> flackr: right now i think they're aligned with scrollTop and scrollLeft, so they're not WM-aware<br>
&lt;TabAtkins> flackr: The math works out fine with potentially negative ranges<br>
&lt;TabAtkins> flackr: But question is if they should be logical, or stay aligned?<br>
&lt;TabAtkins> fantasai: and you brought up suggestion that maybe we need logical scroll offset accessors<br>
&lt;TabAtkins> ydaniv: We have some logical options for the visual viewport<br>
&lt;TabAtkins> fantasai: I feel like it would be nice ot have logical accessors on the element, and also made this logical as a result.<br>
&lt;fantasai> TabAtkins: If you're RTL&lt; it defaults to being scrolled all the way to the right<br>
&lt;fantasai> TabAtkins: So my opinion is that the default behavior should match the experience of the person working with it<br>
&lt;fantasai> TabAtkins: even if the accessors don't yet exist<br>
&lt;TabAtkins> flackr: sure, we can go with logical, and have a followup to do logical accessors on scrollports<br>
&lt;TabAtkins> astearns: so proposed resolution is that for SLA we use the logical interpretations of scrolling?<br>
&lt;TabAtkins> flackr: yep<br>
&lt;fantasai> wfm<br>
&lt;TabAtkins> ydaniv: yeah sounds good<br>
&lt;TabAtkins> RESOLVED: SLA uses logical interpretations of scrolling (rather than scrollLeft/Top always)<br>
&lt;TabAtkins> astearns: And flackr will raise a separate issue for logical scroll-position accessors<br>
</details>


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Received on Monday, 20 March 2023 15:43:09 UTC