What should be the value of the width attribute, so that the width of the element adjusts itself to the current width of its parent element? code example

Example: width defined by content css

/* <length> values */
width: 300px;
width: 25em;

/* <percentage> value */
width: 75%;

/* Keyword values */
width: max-content;
width: min-content;
width: fit-content(20em);
width: auto;

/* Global values */
width: inherit;
width: initial;
width: unset;