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Position fixed vs position sticky

position: fixed has been a staple of CSS for a long time now, and it’s served us well. More recently, we’ve been treated with position: sticky.

Both of them are really similar but there are some important differences. In this post, we’ll be looking at the differences, as well as the use cases for each.

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Creating a website - getting over the anxiety of starting with a blank file

One of my favorite classes to teach at my school is the introduction to HTML & CSS. It’s so much fun seeing people who’ve never even seen a line of code be able to make websites on their own after only a bit of time together.

As much fun as it is once they start to get the hang of it, I also see how daunting it is for them the first time I tell them to make a page from scratch without my help. It also lets me see all the mistakes they make when they start trying to make their very first pages all on their own.

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How to append a unit to a unitless CSS custom property with calc()

I’ve seen complaints that you can’t append a unit to a custom property.

What you can’t do

The complaints seem to come from not being able to do something like this:

.icon {
  --scale: 1;

  /* this doesn't work */
  font-size: var(--scale) + 'px';
}

Granted, that would be awesome if we could do that. But we aren’t writing JavaScript, so we can’t.

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Write more effecient CSS with the `+` combinator

The + combinator is amazing but I always forget that it exists. I recently used it when making a few updates to this site, and thought it would be fun to explore why I love it so much.

How the + combinator works

I feel like the MDN describes it perfectly, saying “The + combinator selects adjacent siblings. This means that the second element directly follows the first, and both share the same parent”.

An example

On my own site, I have the following markup on my articles (such as this one).

<h1>Article title</h1>
<time class="date">March 3 2019</time>
<p>
  Lorem ipsum dolor sit amet consectetur adipisicing elit. Accusamus in ullam
  voluptatibus consequatur, vel hic?
</p>
<p>
  Quia, ipsam! Dolores corporis ullam, ut natus consequatur, quaerat
  necessitatibus officiis, incidunt rerum ex ea!
</p>
<p>
  Velit amet blanditiis tempora, incidunt, sint dolor architecto at et
  similique, ex nulla hic fugiat.
</p>

I don’t have classes on any of my paragraphs because I write everything with markup. I could configure things to add something like a .intro to the first paragraph, but there is no need.

I could use something like p:nth-of-type(1) but that would have a lot of potential to break things throughout the rest of a site. In my case, it would affect all my pages, so I’d have to add another selector to ensure I’m on an article.

A great solution is using the + combinator in my CSS selectors:

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CSS remedy - rethinking the approach to CSS resets

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What the heck is background-attachment local

I recently came across background-attachment: local because of this super amazing trick over on Smashing Magazine that adds a gradient on the sides of a table… only if the table is overflowing. It’s really neat, but while I knew of the scroll and fixed values for background-attachment, I’d never heard of local before.

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Native HTML form validation

HTML can do a boatload of form validation all on it’s own. You probably know that you can put the required attribute and the form won’t submit if that’s missing.

On top of required you can also use type= to define the type, which can help with validation for things like email addresses (<input type="email">).

But what if you want someone’s first name, and you don’t want them to put in numbers or strange symbols? Or what if you want a password that has a minimum length, a mix of upper- and lower-case letters, and a symbol?

You can do all of that with the pattern attribute!

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List attributes you didn't know existed

I think most people know that you can change the type of an <ol>, so you can get something like this:

  1. List Item
  2. List Item
  3. List Item

But, did you know you can also easily reverse the order of a list so it counts down instead of up? Or, what about starting it at a different number (or letter)?

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