If the text is being displayed or printed with a normal "kerned" font, then all punctuation should be followed by a single space. Double spacing should only be used for monospaced fonts (eg Courier), but even then only for sentence-ending punctuation like question marks, exclamation points and full stops (periods). This convention dates back to the days of the typewriter, which used monospace fonts.
Once.
One space after a semicolon.
Only one space follows a semicolon.
I am a genius! i know how many times Julie Payette went to space. Julie went into space 3 times.
3 times
Once.
When using a semicolon you put one space after the semicolon.
Generally, there is one space that follows a semicolon in written English. This space is used to create clear separation between the semicolon and the next word or phrase.
One space after a semicolon.
There should be one space.
Only one space follows a semicolon.
It makes a space in HTML coding.
Traditionally, two, but I find using just one okay too.
4
After a semicolon, there is never more than one space. Spacing after colons (and periods) depends on the style guidelines you're using. Some call for one space, others for two. The most important thing, however, is to be consistent. Use the same spacing after colons as you do after periods throughout the entire document.
how many times has tom peake been to Space
I am a genius! i know how many times Julie Payette went to space. Julie went into space 3 times.