Author: alex

Description:
According to http://www.mediawiki.org/wiki/Help:Parser_functions_in_templates

    {{#if: {{{1|}}} | Parameter 1 is defined and non-null/non-empty. | Parameter 1 is not defined, or is defined but null. It contains only empty string(s) or breaking space(s) etc.}}

Result
    Parameter 1 is not defined, or is defined but null. It contains only empty string(s) or breaking space(s) etc.

But if Parameter 1 contains an Ideographic space 3000 rather an ASCII space 20 then it is treated as non-null.

This affects users editing a Latin based Wikipedia (i.e.. English) with a Asian based computer (i.e.. Japanese).

For example see this edit:

http://en.wikipedia.org/w/index.php?title=Kawagoe_Station&diff=306196218&oldid=305944473

which changes the spaces from U 3000 to U 20 and the "statistics" line in the Station infoboxes are then correctly formatted.

The U 3000 space should be evaluated as whitespace within a template if function.

For an example of the problem with non-breaking spaces, compare the output of the two revisions at https://zu.wikipedia.org/w/index.php?title=Hepatitis_A&type=revision&diff=38809&oldid=38808.