Unverified50% confidenceFactExact time

The CSS expression border-radius: calc(100vw - 100%) makes the corner radius approach 0 when the element width is close to the viewport width, and the narrower the element, the larger the corner radius.

1

Sources

50%

Confidence

Long-term

Relevance

10/22/2026

First Seen

Sources

CSS Conditional Border-Radius Trick: Auto-Square Corners When Elements Touch the Edge

youtubeKevin Powell10/22/2026

Related Entities

border-radiusconcept calc()concept vwconcept

Related Claims

UnverifiedIn border-box mode, width/height includes the combined total of content + padding + border, whereas in content-box mode, width/height only defines the size of the content area.63% similar UnverifiedThe CSS block-size property belongs to the logical properties specification, is equivalent to height in the default horizontal writing mode, and is equivalent to width in vertical writing mode.59% similar

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