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CSS: 100% font size - 100% of what?

There are many articles and questions about percentage-sized vs other-sized fonts. However, I can not find out WHAT the reference of the percent-value is supposed to be. I understand this is 'the same size in all browsers'. I also read this, for instance: ...
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What does “O(1) access time” mean?

I have seen this term "O(1) access time" used to mean "quickly" but I don't understand what it means. The other term that I see with it in the same context is "O(n) access time". Could someone please explain in a simple way what these terms mean? ...
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#ifdef #ifndef in Java

I doubt if there is a way to make compile-time conditions in Java like #ifdef #ifndef in C++. 8 Answers ...
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Set environment variables from file of key/value pairs

TL;DR: How do I export a set of key/value pairs from a text file into the shell environment? 33 Answers ...
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CSS selector - element with a given child [duplicate]

I'm looking to make a selector which will select all elements if they have a specific child element. For example, select all <div> with a child <span> . ...
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how to deal with google map inside of a hidden div (Updated picture)

i have a page and a google map is inside a hidden div at first. I then show the div after i click a link but only the top left of the map shows up. ...
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How to add a new row to an empty numpy array

Using standard Python arrays, I can do the following: 6 Answers 6 ...
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How to get all groups that a user is a member of?

PowerShell's Get-ADGroupMember cmdlet returns members of a specific group. Is there a cmdlet or property to get all the groups that a particular user is a member of? ...
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Find the division remainder of a number

How could I go about finding the division remainder of a number in Python? 12 Answers ...
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Relative imports in Python 3

I want to import a function from another file in the same directory. 13 Answers 13 ...