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Nested order list with a combination of numbers, alphabets, and Roman numerals for numbering?

I want to create an ordered list that looks like this:

1. Item_1
2. Item_2:
    a. Subitem_1
    b. Subitem_2:
        I. Sub-Subitem_1
        II. Sub-Subitem_2
    c. Subtiem_3
3. Item 3

i.e. sub-lists should use alphabets / roman numerals or other such designations for numbering.

I tried nested tags <ol>, but explicitly numbered sub-lists. Is there a way to do this using only HTML ?

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2 answers
<ol type="1|a|A|i|I">

1   Default. Decimal numbers (1, 2, 3, 4)
a   Alphabetically ordered list, lowercase (a, b, c, d)
A   Alphabetically ordered list, uppercase (A, B, C, D)
i   Roman numbers, lowercase (i, ii, iii, iv)
I   Roman numbers, uppercase (I, II, III, IV)

http://www.w3schools.com/tags/att_ol_type.asp

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This is certainly possible given the following HTML:

<ol>
    <li>Item_1</li>
    <li>Item_2:
        <ol>
            <li>Subitem_1</li>
            <li>Subitem_2:
                <ol>
                    <li>Sub-Subitem_1</li>
                    <li>Sub-Subitem_2</li>
                </ol></li>
            <li>Subitem_3</li>
        </ol></li>
    <li>Item 3</li>
</ol>

And CSS:

ol {
    list-style-type: decimal;
}

ol > li > ol {
    list-style-type: lower-alpha;
}

ol > li > ol > li > ol {
    list-style-type: upper-roman;
}

JS Fiddle demo .

Or you may be less strict on the specifics of CSS selectors:

ol {
    list-style-type: decimal;
}

ol ol {
    list-style-type: lower-alpha;
}

ol ol ol {
    list-style-type: upper-roman;
}

JS Fiddle demo .

Literature:

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