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I'm trying to apply CSS transition effect when an element comes to viewport (i.e. when user scrolls to it), but not before.
I already know how to use CSS transitions, but how do I apply them only when the element comes to viewport?
What it the best way of doing this? If there's some library's to simplify the task, I would be glad to know.
Give CSS3 Animate It a go, makes the whole process as simple as adding a few clases.
http://jackonthe.net/css3animateit/
Then you can just add the classes like this to get started.
<div class='animatedParent'>
<h2 class='animated bounceInDown'>It Works!</h2>
</div>
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I was going through different video tutorials and a few suggested to use ::before pseudo selector to apply background image.
Is there any specific reason to follow this trend?
It is really a personal preference. Using ::before and ::after pseudo elements in this case allows you to insert images without the need for adding extra html elements.
Here is an example by Bryan Robinson of its clever usage
You can see how it can be used to create a three layered image background with just a single html element.
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There are differences in performance between the SVG filter and the CSS Filter?
hmmm somehow i shouldn't think the performance would be much of an issue CSS filters are in a way based off SVG filters.
However in terms of critical path, if you embed your svg's (including the filters) i would think they might have better performance because the filters should be parsed with the DOM instead of having a css pointer attached and then rendered after the css is parsed.
If you use sprites however the performance would be pretty much the same.
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I'm using src img to place a logo in the header section. What would the pros and cons be of placing the image in a < div > vs leaving it as a plain ol' img src?
I'm thinking that, for the most part, I should be able to apply the same properties (such as margin, class, ID, etc.) to both. Am I missing something?
Note: I'm not interested in a background-image since I consider the logo content.
tl;dr wrapping is always good thing, if you are going to maintain that code for long enough time.
because you can created very targeted css, show, hide could be easier, round corners and adding text for accessibility will be easier etc..
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I am writing a mobile/web app which has coloured clickable and movable circles.
I am aware of the fact that I can draw them in two ways:
A div using border-radius
A <circle> in a <svg>
Now considering the fact that with svg I can take advantage of doing cool animations, why one over the other?
It seems to depend on what you're going to do with the circles.
If they're just buttons for a link, stick with a div, But if you're going to do all sorts of animation or create a game, I might go with SVG as it's more flexible but not supported by some old or mobile browsers.
I will update this answer with more info if you answer my question comment.
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Is there a way to create a background using CSS without the image? with color, and texture?
As Dustin said, there's no "texture" CSS feature. however, if you're using CSS3, you can do some pretty cool tricks like gradients or shadowing to make some neat backgrounds.
No, there is no "texture". However if you find a color and could drop the texture then you can. I would just find a small image to repeat.