Fresh Hot CSS Features!

(AKA things you may have missed

in the last 5 years)

Alex Riviere

Senior Web Developer at Traina

https://alex.party

That Conference - ThatConference.com
Thank You: Unspecified Software Co., Intellibus, Vonage, frontegg, Yum! Digital + Technology

Slides:

https://slides.com/fimion/that-conf-tx-2023/

This talk will cover:

  • Custom Properties
  • CSS Grid
  • min(), max(), clamp()
  • Logical Properties
  • :is() and :where()
  • :has()
  • @layer
  • @container

Custom Properties

(AKA CSS Variables)

body {
  color: #000000;
  background-color: #ffffff;
}

.invert {
  color: #ffffff;
  background-color: #000000;
}

Custom Properties

The Original Way

// _vars.scss
$color-ink: #000000;
$color-paper: #ffffff;

// _style.scss
body{
  color: $color-ink;
  background-color: $color-paper;
}

.invert{
  color: $color-paper;
  background-color: $color-ink;
}

Custom Properties

Preprocessed Variables (SCSS)

:root{
  --color-ink: #000000;
  --color-paper: #ffffff;
}

body{
  color: var(--color-ink);
  background-color: var(--color-paper);
}

.invert{
  color: var(--color-paper);
  background-color: var(--color-ink);
}

Custom Properties

Modern CSS

Custom Properties

Support:

Custom Properties

More Info:

CSS Grid

(AKA Better layout tools)

CSS Grid

CSS Grid

Bootstrap 5 Example

CSS Grid

Using Grid

CSS Grid

Example: Bar charts

(Credit: Miriam Suzanne)

CSS Grid

Example: Mondrian Art

(Credit: Jen Simmons)

CSS Grid

Example: Center Things

CSS Grid

Support

CSS Grid

More Information:

min(), max(), clamp()

(AKA write fewer media queries)

Definitions

  • min(): Give me the minimum value from a list of number values
  • max(): Give me the maximum value from a list of number values
  • clamp(): Give me a number value based on a dynamic measurement, but stop at the minimum and maximum sizes given.

min() Example

CodePen: Alain

max() Example

CodePen: Alain

clamp() Example

CodePen: Alain

min(), max(), clamp()

Support

min(), max(), clamp()

More Information:

Logical Properties

(AKA It's Okay to forget Left and Right)

Let's talk about margin...

.my-style{
  margin:10px;
}
/* Is equivalent to... */
.my-style{
  margin-top: 10px;
  margin-right: 10px;
  margin-bottom: 10px;
  margin-left: 10px;
}
.my-style{
  margin: 0 10px;
}
/* Is equivalent to... */
.my-style{
  margin-top: 0;
  margin-right: 10px;
  margin-bottom: 0;
  margin-left: 10px;
}
.my-style{
  margin: 0 10px 10px;
}
/* Is equivalent to... */
.my-style{
  margin-top: 0;
  margin-right: 10px;
  margin-bottom: 10px;
  margin-left: 10px;
}
.my-style{
  margin: 2px 4px 6px 8px;
}
/* Is equivalent to... */
.my-style{
  margin-top: 2px;
  margin-right: 4px;
  margin-bottom: 6px;
  margin-left: 8px;
}
.my-style{
  margin: 10px;
}
/* adds to... */
.my-style.extraaaaa{
  margin-left: 20px;
  margin-right: 20px;
}

Block properties

  • *-block
  • *-block-start (*-top)
  • *-block-end (*-bottom)

Inline properties

  • *-inline
  • *-inline-start (*-left)
  • *-inline-end (*-right)
.my-style{
  margin: 10px;
}
/* adds to... */
.my-style.extraaaaa{
  margin-inline: 20px;
}

Logical Properties

Support:

Logical Properties

More Information:

:is() and :where()

(AKA Write fewer selectors)

.container a strong,
.container p strong,
.container button strong,
.container code strong,
.container section strong{
  font-weight: 900;
}
.container :is(a, p, button, section) strong{
  font-weight: 900;
}
nav.nav-bar ul li a.nav-link{
  color:blue;
}


:is(#\!important, a.nav-link){
  color:red;
}
body{
  background-color: black;
}

:where(body){
  background-color: white;
}

:is() and :where()

Support:

:is() and :where()

More Information:

:is()

:where()

:has()

(AKA "The Parent Selector")

A Common Problem

.input-wrapper:has(input:invalid)
​<div class="input-wrapper">
<input type="email" value="alex" />
​</div>
:has()

This:has(a.solution) 

:has()

Support:

:has()

More Information:

@layer

(AKA Stop using !important)

@layer

.text-red{
  color:red;
}

.my-class{
  color:blue;
}

@layer

.text-red{
  color:red !important;
}

.my-class{
  color:blue;
}

@layer

.my-class{
  color:blue;
}

.text-red{
  color:red;
}

@layer

.my-wrapper .my-class{
  color:blue;
}

.text-red{
  color:red;
}

@layer

@layer style, utility;

@layer style {
  .my-wrapper .my-class{
    color:blue;
  }
}

@layer utility{
  .text-red{
    color:red;
  }
}

@layer

@layer style, utility;

@layer utility{
  .text-red{
    color:red;
  }
}

@layer style {
  .my-wrapper .my-class{
    color:blue;
  }
}

@layer

@layer framework, style, utility;

@import url('framework.css') layer(framework);

@layer utility{
  .text-red{
    color:red;
  }
}

@layer style {
  .my-wrapper .my-class{
    color:blue;
  }
}

@layer

Support:

@layer

More Information:

@container

(AKA box-size media queries)

@container

@container

@container

@container

@container

@container

@container

.blue-box{
  display:grid;
  grid-template-columns: 1fr;
}

@media screen and (min-width: 450px) and (max-width: 1023px){
  .blue-box{
    grid-template-columns: 1fr 1fr;
  }
}

@media screen and (min-width: 1024px) and (max-width: 1439px){
  .blue-box{
    grid-template-columns: 1fr;
  }
}

@media screen and (min-width: 1440px){
  .blue-box{
    grid-template-columns: 1fr 1fr;
  }
}

@container

.blue-box-wrapper{
  container-type: inline-size;
  container-name: blue-box;
}
.blue-box{
  display:grid;
  grid-template-columns: 1fr;
}

@container blue-box (min-width: 450px) {
  .blue-box {
    grid-template-columns: 1fr 1fr;
  }
}

@container

@container

Support:

@container

More Information:

Thank You!

Jon Neal - For making an app that says the date when features were added to the browser

Slides:

https://slides.com/fimion/that-conf-tx-2023/

Deets:

Alex Riviere

  • @fimion on GitHub, Twitter, CodePen
  • @fimion@notacult.social
  • alex.party

CodePens:

 https://codepen.io/collection/aMZPPq

THAT Conference 2024: January 29th - February 1st

Fresh Hot CSS Features - THAT Conf TX 2023

By Alex Riviere

Fresh Hot CSS Features - THAT Conf TX 2023

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