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PIQ 10111111 - What is doctype?Why do you need them?
Doctype is an instruction to the browser to inform about the version of html document and how the browser should render it based on the version.
If you were not to include the browser would render in quirks mode, which makes the browser’s life difficult.
PIQ 10011111 - Which unit would you use; px,em, % or pt?
This is dependent on what you are using it for. For obvious reasons, “px” is a bad choice for something that is responsive like a shape or picture. But you would use it for a font size. “em” maintains relative size. Which means you have responsive text or it is used widely for paddings or spacing between text blocks. “%” is a very tricky one to use in vertical anything, but it works wonders in horizontal padding or margins. “pt” is used widely in anything used in print, but isn’t a very responsive design unit.
PIQ 10001111 - What does it mean to put an absolute position in css?
Absolute is exactly what it sounds like, you put it in a specific position, wherever you want to placer it. This position effect is actually set relative to the element’s parent, if there is no parent element, then it will be reference to the whole HTML page
PIQ 10000111 - Why must you write columns by the smallest to largest size they might be in HTML?
When you are making a responsive design webpage, you must list your column choices and sizes from the smallest to largest. Lets say you are making your webpage to be optimized on all four different sections: extra-small, small, medium and large. If you were to put large first, whatever is defaulted inside the code (if you are using frameworks) it would happen that way. For example, when using Bootstrap, if you use all Medium sizes, it will size down to extra small however not small, depending on your design. Having all four choices doesn’t hurt that much download speed, its highly recommended to optimize it for all four, but some have two set designs and use paddings and simple layouts to even out the design, making the UI simple, even if there is not very much items of info or media.
PIQ 1111111 -- What are the difference between null and undefined
Javascript has two different values for nothing, null and undefined. undefined means that is value is not defined, but could be declared. null means empty or non-existent value, indicates "no-value".
PIQ 1000111 - What is a closure, and how/why would you use one?
In simple and plain terms, it is a function that can be stored inside of a variable to be called on later or continuous. It has the special ability to access other variables local to the scope it was created in. Functions like <code>document.onclick</code> is a closure. Why closures are so popular in JS is that they are used a lot for event handling. However keep in mind that a large volume of closures can lead to memory leaks.
PIQ 1000011 -- GET and POST, What are they and which ones is safer when dealing with sensitive data?
GET and POST are two different HTTP(Hyper Text Transfer Protocol) requests.
GET requests a a specified resources. Not that GET should not be used for operations that cause side-effects. Example would be any post on a blog or status update as it would not exist when you refresh and went to get that resource again.
POST submits data to be processed, example would be a HTML form of your name on a webpage. The data is included in the body request. This may result in the creation of a new resource or updated directory of items.
Simplified explanation would be GET is used for the retrieval of remote data and POST is to insert/update data.
POST is the only one you should ever use for submitting data, since GET might be accessible through a certain Request-URL then.
PIQ 1000001 -- Explain how a browser determines what elements match a CSS selector?
The browser reads your CSS file from right to left. First looks for all elements matching the key selector (the right-most) Then checks if it matches or is under the next(left-most) element. If the browser can determine the element you are looking for using just one selector and you've used more, you just have miscellaneous code.
