Before Unicode, it was necessary to match text encoding with a font using the same encoding system. Failure to do this produced unreadable gibberish whose specific appearance varied depending on the exact combination of text encoding and font encoding. For example, attempting to view non-Unicode Cyrillic text using a font that is limited to the Latin alphabet, or using the default ("Western") encoding, typically results in text that consists almost entirely of vowels with diacritical marks. (KOI8 "" (, library) becomes "âÉÂÌÉÏÔÅËÁ".) Using Windows codepage 1251 to view text in KOI8 or vice versa results in garbled text that consists mostly of capital letters (KOI8 and codepage 1251 share the same ASCII region, but KOI8 has uppercase letters in the region where codepage 1251 has lowercase, and vice versa). In general, Cyrillic gibberish is symptomatic of using the wrong Cyrillic font. During the early years of the Russian sector of the World Wide Web, both KOI8 and codepage 1251 were common. As of 2017, one can still encounter HTML pages in codepage 1251 and, rarely, KOI8 encodings, as well as Unicode. (An estimated 1.7% of all web pages worldwide – all languages included – are encoded in codepage 1251.) Though the HTML standard includes the ability to specify the encoding for any given web page in its source, this is sometimes neglected, forcing the user to switch encodings in the browser manually.