It is important that you choose only [https://en.wikipedia.org/wiki/Unicode_font UNICODE font] for the text entry. Non-UNICODE fonts are likely to not render correctly on a web page. Ubuntu GNU/Linux uses only UNICODE fonts, hence you will not have any problems. However if you are using Microsoft Windows, your system may have non-UNICODE fonts, which you should not use.
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It is important that you choose only [https://en.wikipedia.org/wiki/Unicode_font UNICODE font] for the text entry. Non-UNICODE fonts are likely to not render correctly on a web page. In case of the latin script (used in English)