internationalization – Are the periods after the numbers of a list an international convention?

Short answer:
The dots are the default counter suffix for implementing the ordered list in web browsers.

Long answer:
If you use ordered lists in Web pages, the browsers implement them using period after. If not specified, the the default value will be " 2E 20" (".", an end point followed by a space).
You can see an example of a specification:

Arabic numerals are just one type of predefined counters possible, which is Due to the requirements of typography and internationalization, the W3C has invented ways to replace default values.

The suffix of the counter can be changed from the default period to , , or .

Also common, I saw parentheses (")"closed parenthesis, called unmatched parenthesis). Depending on the hierarchy of your ordered lists, you may need to lower several levels. As a result, you may need several counter suffix styles (points & # 39; for level 1, simple parentheses & # 39;) & # 39; for level 2, paired parentheses (). level 3, colon: & # 39; for level x, etc.).

1.1 ...
(a) ...
a.1: ...
2) or (2) ...
3) or (3) ...

Regarding your question on the international convention. I do not know, but you can find out more about the subject at

From the point of view of usability, I think that a suffix is ​​needed because it makes it clear to the user that it is a list item and not a problem. 39, a value.
For example, by reading:

1. apples
2. oranges

I will know that it is an enumeration and not a quantitative information:

1 apple
2 oranges

So, whatever suffix you use (whether it's an international convention or not), I would suggest using a suffix to mark ordered lists accordingly.