in epub3
I don't know in epub2
About font-size and font-color
Added as below to CSS
(Size and color are examples)
Code:
/* font-size */
.font-0em50 { font-size: 0.50em; }
.font-0em60 { font-size: 0.60em; }
.font-0em70 { font-size: 0.70em; }
.font-0em75 { font-size: 0.75em; }
.font-0em80 { font-size: 0.80em; }
.font-0em85 { font-size: 0.85em; }
.font-0em90 { font-size: 0.90em; }
.font-1em { font-size: 1.00em; }
.font-1em10 { font-size: 1.10em; }
.font-1em15 { font-size: 1.15em; }
.font-1em20 { font-size: 1.20em; }
.font-1em30 { font-size: 1.30em; }
.font-1em40 { font-size: 1.40em; }
.font-1em50 { font-size: 1.50em; }
.font-1em60 { font-size: 1.60em; }
.font-1em70 { font-size: 1.70em; }
.font-1em80 { font-size: 1.80em; }
.font-1em90 { font-size: 1.90em; }
.font-2em { font-size: 2.00em; }
.font-2em50 { font-size: 2.50em; }
.font-3em { font-size: 3.00em; }
/* font-color*/
.color-black { color: #000000; }
.color-dimgray { color: #696969; }
.color-gray { color: #808080; }
.color-darkgray { color: #a9a9a9; }
.color-silver { color: #c0c0c0; }
.color-gainsboro { color: #dcdcdc; }
.color-white { color: #ffffff; }
.color-transparent { color: transparent; }
.color-red { color: #ff0000; }
.color-blue { color: #0000ff; }
.color-cyan { color: #00ffff; }
.color-magenta { color: #ff00ff; }
.color-orangered { color: #ff4500; }
.color-yellow { color: #ffff00; }
.color-green { color: #008000; }
.color-purple { color: #800080; }
When decorating
Code:
<span class="font-1em20">text</span>
<span class="color-red">text</span>
Reader may not support font-color.
iBooks can be displayed. (I haven't checked all the colors.)
Since epub uses the same standard as the Web, I think the history of Web development will be helpful.
If you have time, support it please.