<style>
	.demo_css_sprt, .demo_css_sprt div	{
		border: dotted 1px red;
		padding: 1em;
	}
	.demo_css_sprt div	{
		margin: 1em 0;
	}
	.demo_css_sprt div[class^="ab"]	{
		background: mistyrose;
	}
	.demo_css_sprt p	{
		border: dashed 1px blue;
		padding: 1em;
	}
</style>
<div class="demo_css_sprt">
	要素1
	<div class="zab">要素2</div>
	<div class="ab">要素3</div>
	<div class="abc">要素4</div>
	<p class="abc">要素5</p>
	<p class="bcd">要素6</p>
</div>