Guide: Things to Know About CSS Percentage Margins Calculator
In this article, I’ll take you through some of the most obscure CSS properties and how to use them in your own projects.
The free CSS test I’ve been offering online for the past six months yielded results that showed a question that hardly anyone got right. Of the thousands of people who took the test, less than 14% was correct. ..
The question boils down to this: How do you calculate the percentage margins for a product?
The question
To give your content a top margin, add this to the CSS of your document: .content { margin-top: 20px; } ..
So, what is the percentage of people who can answer correctly that 13.8%? ..
What I like about this question is that it seems so clear. So much so, I suspect most people are just guessing and making a wrong guess. But it may not seem obvious to you. For example, if you’re really using your imagination there are many ways the browser could calculate such a margin. ..
- Which of the following best describes how you feel about your job? a. I’m satisfied with my job b. I’m unhappy with my job c. I’m not satisfied with my job d. I’m dissatisfied with my job
- Which of the following best describes how you feel about your co-workers? a. They’re okay to me b. They’re not okay to me c. They’re great to me, but not perfect to me d. They’re great to me, but not perfect to me and they make me feel bad
- Which of the following best describes how you feel about your future? a. You have no idea what it looks like b. You hope for a better future c. You don’t know what the future holds d. You hope for a better future and are scared of it
The content div and container div are both 10% of the height of the content div and container div, respectively.
Remember that only 13.8% of people can choose the correct answer from this list. That’s much worse than coincidence!
- The answer to the question is “no.”
- There is no answer to the question.
Container or content?
If the content div is the only div that has a margin, then the margin is based on the size of the content div itself.
This isn’t a gimme, but you can probably rely on your instincts. If I set a div to 50% of the width of the container, and I want the left and right margins to fill the rest of the space, I would of course set them to 25% each (so the percentages count up to 100%). For that to work, percentage margins must be based on the dimensions of the container.
The test is designed to help people figure out which part of the answer they got right. Two-thirds of the people taking the test get this part of the answer right.
Width or height?
If the element has a width or height, does the margin top automatically adjust to that?
If you’ve been paying attention, you’re probably already on your guard. This has to be one trick question, right? ..
The answer is not length, but it is something else entirely.
The top margin of a container is a vertical measurement. If a block is 50% of the height of the container, and you have given it a top margin of 25%, then you would expect that to be 25% of the height of the container. But you would be wrong. The top margin is actually 15%.
Almost 80% of people who take the test agree that it doesn’t have to be long. ..
It makes sense … No, really!
“CSS is a language that enables you to style web pages. It is used to create the look and feel of a document, and to control how text appears on screens.”
It is illegal to specify the width of a border as a percentage. ..
- It’s more accurate.
- It’s more consistent with other layout properties. CSS vertical margins are based on the width of the containing block, rather than on the height of the content. This is more accurate because it takes into account the padding and border widths of the containing block, which can affect how much space a given element takes up vertically. And it’s also more consistent with other layout properties, like font size and line height, because they all use pixels instead of percentages. ..
Horizontal and vertical consistency
.margin-left: 10px; .margin-right: 10px; .margin-bottom: 5px;
margin-left: 10%;
In a recent article, the writer compared the margins on different sides of a block of text. He found that if margin-left and margin-right were based on the width of the container and margin-top and margin-bottom were based on height, they would usually be different!
Avoid circular dependence
In order to calculate the width of a block, you need to know its parent’s width.
The height of a block is another matter.Usually, the height depends on the combined height of the content and the block’s height. Do you see the problem?
To get the height of a content block, you need to know the top and bottom margins applied to it. If those margins depend on the height of the parent block, you can’t calculate one without knowing the other!
This is a problem with using vertical margins on a page that uses a container that is wider than the width of the page. This causes the circular dependency problem, which makes it possible to format the page using other methods.
Ace the class
The question on the test is difficult, but it’s also the one that will determine your success in this class. Do you want to know how you would do for the rest of the test? Try it for yourself and see how you compare to other students. Most questions are much easier than this one.
In the meantime, I’m looking for a new hardest question! What detail of CSS do you think no one knows? ..
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More about Hongkiat:
Web design: equal column height with CSS 6 CSS Tricks to vertically align content A look at CSS units: pixels, EM and percentage A look at: CSS3 Box sizing
Now Read: 10 Hidden CSS3 Properties You Should Know About
Things to Know About CSS Percentage Margins Calculator: benefits
Faq
Final note
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