[css-flexbox] how 'flex-basis' property interact with 'width' property?

[UnVuTWFu]

It widely said that the flex-basis property will 'override' width property(when the main axis is inline axis).I am trying to find it in specification.

There are two parts maybe related to it:
The 'flex-basis' property
and
Determine the flex base size and hypothetical main size of each item

It seems that the explanation is not very clear.Can you further explain?

[Loirooriol]

https://www.w3.org/TR/2025/CRD-css-flexbox-1-20251014/#main-size

In flex layout, the main size is controlled by the flex property rather than directly by the main size property.

Or just follow the sizing algorithm.