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border在加载后消失是怎么回事?

.areo{
    top: 0;
    position: sticky;
    border-bottom: 1px solid red;

areo,在加载之初是有border的,但是在加载完后就会消失。

放大后发现,并不是消失,而是变小了。如果设为2px,会在加载后变成1px,也就是说加载完后border-size会减半。

但如果去掉position就又变回正常,十分不解这是为什么……


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