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[css-anchor-position-1] Add changes section
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css-anchor-position-1/Overview.bs

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Changes {#changes}
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Significant changes since the <a href="https://www.w3.org/TR/2024/WD-css-anchor-position-1-20240326/">26 March 2024 Working Draft</a>:
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* Renamed <css>inset-area</css> to 'position-area'
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* Added ''position-anchor: auto''
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to use the [=implicit anchor element=] as the [=default anchor element=]
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* Added top-layer details to the [=acceptable anchor element=] definition
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* Removed the <css>implicit</css> keyword from the [=anchor functions=]
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(omitting an anchor name does the same thing)
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* Removed the "reduce the size of the available space" behavior from ''anchor-center'',
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now that Align defines how to shift to avoid overflow.
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* Added 'position-visibility', to hide the positioned element in some cases.
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* Added a11y guidance ([[#accessibility]])
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* Expanded the set of properties that ''anchor-size()'' is used in
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(to all the relevant [=accepted @position-try properties=]).
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* Renamed <css>position-try-options</css> to 'position-try-fallbacks'
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* Removed the <css>inset-area()</css> function from 'position-try-fallbacks'
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(you just use a 'position-area' value directly now).
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* Defined how to [=swap due to a try-tactic=].
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* Expanded the details of how to [=determine position fallback styles=].
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Significant changes since the <a href="https://www.w3.org/TR/2024/WD-css-anchor-position-1-20241004/">4 March October 2024 Working Draft</a>:
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* Switched the center track for 'position-area' to default to 'align-self/center'' alignment.
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(<a href="https://github.com/w3c/csswg-drafts/issues/11803">Issue 11803</a>)
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* Defined the [=implicit anchor element=] of [=pseudo-elements=] to be their [=originating element=].
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(<a href="https://github.com/w3c/csswg-drafts/issues/11792">Issue 11792</a>)
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* Rewrote how scrolling is handled and responded to ([[#scroll]]),
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so that the positioned element can respond to its anchors being scrolled <em>when possible</em>
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(when the positioned element is first rendered, or changes fallbacks).
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(<a href="https://github.com/w3c/csswg-drafts/issues/10999">Issue 10999</a>)
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* Rebased 'position-visibility' to use the newly defined ''visibility: force-hidden'' value
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instead of creating a custom concept,
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in order to better enable transitions.
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(<a href="https://github.com/w3c/csswg-drafts/issues/10182">Issue 10182</a>)
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* Fixed some errors in the anchor resolution algorithm.
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(<a href="https://github.com/w3c/csswg-drafts/issues/11030">Issue 11030</a>,
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<a href="https://github.com/w3c/csswg-drafts/issues/11170">Issue 11170</a>)
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* Fixed some errors in the list of <<position-area>> keywords.
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(<a href="https://github.com/w3c/csswg-drafts/issues/11372">Issue 11372</a>,
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<a href="https://github.com/w3c/csswg-drafts/issues/11371">Issue 11371</a>)
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* Defined that 'anchor-scope' idents are [=tree-scoped names=] (and thus compare specially with [=anchor names=]).
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(<a href="https://github.com/w3c/csswg-drafts/issues/10526">Issue 10526</a>)
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* Clarified that the [=computed value=] of 'position-area' does not distinguish long and short forms of logical keywords.
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(<a href="https://github.com/w3c/csswg-drafts/issues/11828">Issue 11828</a>)
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* Clarified that certain ''anchor()'' resolaveability checks are at [=computed value=] time, not parse time.
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(<a href="https://github.com/w3c/csswg-drafts/issues/10955">Issue 10955</a>)
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* Editorial reorganization of sections, particularly [[#position-area]].
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See also <a href="https://www.w3.org/TR/2024/WD-css-anchor-position-1-20241004/#changes">Previous Changes</a>.

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