如何在文本框聚焦时显示任何div？

Question

如何显示div.show何时input.searchtext聚焦？

<div class="select-form-holder">
   <input class="searchtext" type="text" value="Find Friends, Movies, T.V shows Games" />
   <div class="show-on-focus">xyz</div>
   <input type="submit" class="btn-search" title="Search" />
</div>

Answer 1

.searchtext:not(:focus) + .show-on-focus {
    display: none;
}

它写道:"如果searchtext是不:focus编,得到了一个兄弟,如果它是show-on-focus".