<FONT FACE="Comic Sans MS" SIZE=“2“ COLOR="Red">
This is comical and red and small</FONT><BR>
<FONT FACE="Comic Sans" SIZE="+2" COLOR="Red">
This is red and big. Is it comical?</FONT><BR>
<FONT FACE="Comic Sans" SIZE="-2" COLOR="Red">
This is red and big. Is it different?</FONT><BR>
+/- 值是指第一个标签还是最后一个元素之前的标签?