Several tricks that I used very often:

Select all the elements with same class except for the first one

While you complaining there's no :not(:first-of-class) selector, you can do this instead:

.foo + .foo {
  margin-top: 1rem;
}

Mimicking grid-gap without using grid layout:

.album {
  --gap: 1rem;
  padding-top: var(--gap);
  padding-left: var(--gap);
}

.album > .photo {
  margin-right: var(--gap);
  margin-bottom: var(--gap);
}

Clear all the predefined styles

a {
  display: block;
  text-decoration: none;
  /* blah blah blah... */
}

a.logo {
  /* This disables all the rules defined above */
  all: unset;
  /* start from fresh */
}

object-fit is one I haven't used too much until recently (due to browser support). Once you can finally get off that IE11 train the web world really opens up!

developer.mozilla.org/en-US/docs/W...

I didn't learn this recently but I tend to forget it from time to time.

The nth-child() selector every now and then throws me off.

I don't know why but I always interpret it like "select the nth child of this element", when in reality is "select this element if it is also the nth child of its parent", to put it in code, let's say we have this structure:

<div class="parent">
    <div class="child"></div>
    <div class="child"></div>
    <div class="child"></div>
</div>

If I want to select the first div with the class name "child", I always first write .parent:nth-child(1), then realize my mistake when the code is not working and rewrite it as .child:nth-child(1)

Not that it's hidden in the depths of css or anything, position: sticky is not so well known/utilized IMO.

Why it's time to embrace position sticky

Matt Studdert ・ Oct 15 '18 ・ 2 min read

#webdev #css #devtips #learning

Same with CSS variables...

CSS Variables Cheat Sheet

Milos Protic ・ Apr 21 ・ 4 min read

#css #webdev

I tend to have multiple languages on my presentations and use the :lang() pseudo-class to tweak the styles for phrases/sentences that are not the main language.

developer.mozilla.org/en-US/docs/W...

Using the tilda to target siblings has huge use cases

.oneElement ~.anotherElement

I once used :placeholder-shown thing to make a material design like floating input label.

I LOVE absolutely positioned ::before and ::after pseudo-elements. I usually use them to either draw lines underneath elements or additional boxes the full size of the element, which you can do wackier things to (like transforms) than using things like borders or background colors.

Example of an underline for a link:

.link {
    position: relative;
}

.link::after {
    /* 'content' value is required - this is just blank */
    content: ""; 
    position: absolute;
    display: block; 

    /* matches the width of the nearest position: relative parent */
    width: 100% 
    height: 2px;

    /* anchor it to the bottom-left corner */
    bottom: 0;
    left: 0;

    background-color: purple;
}

I use them all the time, so I set up a little SASS mixin to save some keystrokes and clean up my code:

/* the mixin (simplified version) */
@mixin pseudo($type) {

    content: "";
    position: absolute;
    display: block;

    if($type == width) {
        width: 100%;
    }
}

/* the code above with mixin */
.link {
    position: relative;

    &::after {
        @include pseudo(width);
        height: 2px;
        bottom: 0;
        left: 0;
        background-color: purple;
    }
}

Once you start playing around with them you'll find there's all kinds of fun stuff you can do without having to change the HTML at all!

Also this 😀
thepracticaldev.s3.amazonaws.com/i...

I'm very much taken by display:contents at the moment. When creating different cases in responsive layouts, the ability it gives to flatten the box tree has a surprising number of uses.