You will need a font that supports the euro sign.

decimal ncr for C1 position of euro sign

Test passes if you do NOT see a euro sign

Assertion: A decimal numeric reference containing the code point for the euro in the Windows 1252 code page should not produce a euro sign.

Notes:
The HTML page is served as UTF-8. The NCR references decimal code point 128, which is a control character in Unicode. The correct decimal code point for the euro is 8364.

html