Re: [w3c/screen-orientation] Editorial: clarify the natural screen orientation (PR #278)

@Copilot commented on this pull request.

## Pull request overview

Clarifies the spec’s definition of the device’s “natural” screen orientation by reframing it as the reference orientation used as the basis for measuring orientation angles, and adds context about platform variability (especially for square/foldable displays), addressing the ambiguity raised in #275.

**Changes:**
- Redefines “Natural” as the reference orientation from which orientation angles are measured.
- Replaces the prior prose/examples with clearer, grammatically corrected examples.
- Adds a note explaining that natural-orientation determination is implementation-defined and may differ across user agents/platforms.







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> +              tablets, desktops, and TVs), while others derive it from the
+              screen's physical dimensions and current rotation. For devices

In the note, “derive it from the screen's physical dimensions and current rotation” is ambiguous and can read as if the natural/reference orientation depends on the *current* orientation angle (which is defined relative to the natural orientation), creating a circular or unstable definition. Consider wording this as the screen’s physical dimensions plus its *default/native* rotation instead.

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