2.1.2 [W3C-HTML52] Section 2.4.4.3. Floating-point numbers

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V0374: Characters "d" and "D" can be used in place of "e" and "E" in a floating-point number

The specification states:

 2.4.4.3 Floating-point numbers
  
     A string is a valid floating-point number if it consists of:
         1. Optionally, a U+002D HYPHEN-MINUS character (-).
         2. One or both of the following, in the given order:
             1. A series of one or more ASCII digits.
             2.  Both of the following, in the given order:
                 1. A single U+002E FULL STOP character (.).
                 2. A series of one or more ASCII digits.
         3. Optionally:
             1.  Either a U+0065 LATIN SMALL LETTER E character (e) or a U+0045 LATIN 
                 CAPITAL LETTER E character (E).
             2.  Optionally, a U+002D HYPHEN-MINUS character (-) or U+002B PLUS SIGN 
                 character (+).
             3.  A series of one or more ASCII digits.

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Characters "d" and "D" can be used in place of "e" and "E" in a floating-point number.