Input:
<small>small element</small>
<span style="font-size: xx-small">xx-small</span>
<span style="font-size: x-small">x-small</span>
<span style="font-size: small">small</span>
<span style="font-size: normal">normal</span>
<span style="font-size: large">large</span>
<span style="font-size: x-large">x-large</span>
<span style="font-size: xx-large">xx-large</span>
<span style="font-size: 5pt">5pt</span>
<span style="font-size: 15pt">15pt</span>

Output:
NSParagraphStyle:
Alignment 4
    LineSpacing: 0
    ParagraphSpacing: 0
    ParagraphSpacingBefore: 0
    HeadIndent: 0
    TailIndent: 0
    FirstLineHeadIndent: 0
    LineHeight: 0/0
    LineHeightMultiple: 0
    LineBreakMode: 0
    Tabs: ()
    DefaultTabInterval: 36
    Blocks: (null)
    Lists: (null)
    BaseWritingDirection: 0
    HyphenationFactor: 0
    TighteningFactor: 0.05
    HeaderLevel: 0
[small element]
    NSFont: Times-Roman 13.00 pt.
[ ]
    NSFont: Times-Roman 16.00 pt.
[xx-small]
    NSFont: Times-Roman 9.00 pt.
[ ]
    NSFont: Times-Roman 16.00 pt.
[x-small]
    NSFont: Times-Roman 10.00 pt.
[ ]
    NSFont: Times-Roman 16.00 pt.
[small]
    NSFont: Times-Roman 13.00 pt.
[ normal ]
    NSFont: Times-Roman 16.00 pt.
[large]
    NSFont: Times-Roman 18.00 pt.
[ ]
    NSFont: Times-Roman 16.00 pt.
[x-large]
    NSFont: Times-Roman 24.00 pt.
[ ]
    NSFont: Times-Roman 16.00 pt.
[xx-large]
    NSFont: Times-Roman 32.00 pt.
[ ]
    NSFont: Times-Roman 16.00 pt.
[5pt]
    NSFont: Times-Roman 7.00 pt.
[ ]
    NSFont: Times-Roman 16.00 pt.
[15pt]
    NSFont: Times-Roman 20.00 pt.
[ ]
    NSFont: Times-Roman 16.00 pt.