initial
设置属性值为默认值。
inherite
设置属性值为父元素的计算值。
unset
相当于继承属性设置为inherit，非继承属性设置为initial
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.some-class {
color: unset; /* will be equal to 'inherit' value */
display: unset; /* will be equal to 'initial' value*/
}
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/* Good */
.common-content * {
all: unset;
}
Understanding the “Initial”, “Inherit” and “Unset” CSS Keywords