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<!DOCTYPE html><meta charset=utf-8>
<style>
.a1, .a2, .a3, .a4, .a5, .a6 { float: left; }
.a1 { line-height: calc(1*2); }
.a2 { line-height: calc(1*2*3); }
.a3 { line-height: calc(1*2*3*1px); }
.a4 { line-height: calc((1*2)*3); }
.a5 { line-height: calc(1*(2*3)); }
.a6 { line-height: calc((1*2*3)); }
.a7 { line-height: calc(-1); }
</style>
<p class="a1">abc<br>def</p>
<p class="a2">abc<br>def</p>
<p class="a3">abc<br>def</p>
<p class="a4">abc<br>def</p>
<p class="a5">abc<br>def</p>
<p class="a6">abc<br>def</p>
<p class="a7">abc<br>def</p>