The CSS flex-basis property specifies the flex basis which is the initial main size of a flex item.
Initialauto
Applies toflex items, including in-flow pseudo-elements
Inheritedno
Percentagesrefer to the flex container’s inner main size
Mediavisual
Computed Valueas specified, with lengths made absolute
Animatableyes, as a length, percentage or calc(); when both values are lengths, they are interpolated as lengths; when both values are percentages, they are interpolated as percentages; otherwise, both values are converted into a calc() function that is the sum of a length and a percentage (each possibly zero), and these calc() functions have each half interpolated as real numbers.
Canonical orderthe length or percentage before the keyword, if both are present
Syntax
Formal syntax: <'width'>
flex-basis: value
flex-basis: inherit
Values
percentage
Computed value returns a percentage of the parent flex container main size property. Negative values are invalid.
absolute length
Defined as a number followed by a absolute unit such as px, mm or pt. Negative values are invalid.
initial
Refers to the default value of the property.
auto
The computed value of flex-basis equals the computed value of the main size of the flex item.
Note: Writing Modes Level 3 specification will introduce the following new keywords: min-content, max-content, fill-available and fit-content.
Note: flex-basis determines the size of the content-box unless specified otherwise using box-sizing.
