Grid and Flexbox - Smashing Conf SF

LAYING OUT THE FUTURE WITH GRID &
FLEXBOX
@rachelandrew @ Smashing Conf SF

YOU CAN START USING CSS GRID
LAYOUT TODAY!
@rachelandrew @ Smashing Conf SF

March 2017 March 2017 March 2017 March 2017 March 2017 Soooooon!

Rachel Andrew
▸ CSS Working Group Invited Expert
▸ Google Developer Expert
▸ co-founder Perch CMS
▸ Old Nerd.
▸ You can ﬁnd me in most places as @rachelandrew you can email
me@rachelandrew.co.uk or check out my site at https://rachelandrew.co.uk

Start using CSS Grid Layout Today
▸ What is grid & why is it different to flexbox?
▸ How do I get started using grid in production?
▸ What about old browsers?
▸ How can we help encourage browsers to give us cool new stuff?

Why not use
ﬂexbox?
CSS Grid Layout

Flexbox is for one-dimensional layout

Grid and Flexbox - Smashing Conf SF

Grid is for two-dimensional layout

.grid {
display: grid;
grid-gap: 20px;
grid-template-columns: repeat(auto-
fill, minmax(200px, 1fr));
}
Grid minmax() and auto-fill
Creating a flexible number of flexible
tracks, with a little bit of grid spec
magic.
http://codepen.io/rachelandrew/pen/evjdLM

If you are adding widths to all your
ﬂex items, you probably need grid.

.example1 {
display: flex;
justify-content: space-between;
flex-wrap: wrap;
margin: 30px;
}
Flexbox
Using space-between
http://codepen.io/rachelandrew/pen/MpBbwX

.example2 {
display: flex;
flex-wrap: wrap;
}
.example2 > div {
flex: 1 1 0;
}
.example2 > div.bigger {
flex: 4 1 0;
}
Flexbox
Some things grow larger than other
things.
This is deﬁned using ﬂex properties on
the item.
http://codepen.io/rachelandrew/pen/MpBbwX

Grid works from the container in

.example1 {
display: grid;
grid-gap: 20px;
grid-template-columns: 1fr 1fr 1fr;
margin: 20px;
}
Grid
Deﬁne column tracks. Items are
constrained by those tracks.
http://codepen.io/rachelandrew/pen/JWBbJP

.example2 {
display: grid;
grid-gap: 20px;
margin: 20px;
}
Grid
To make some tracks larger than
others, we do that when deﬁning the
tracks on the container not on the
item itself.
http://codepen.io/rachelandrew/pen/JWBbJP

Other layout methods start with the
item.

.box {
float: left;
width: 33.3333%;
}
A ﬂoat grid
The ﬂoat property and widths are
added to the items.

.box {
display: inline-block;
width: 33.3333%;
}
inline-block grid
The display property is set to inline-
block and width is added to the item.

.container { 
display: flex; 
} 
.box {
flex: 0 0 33.3333%;
}
Flex grid
We add display: flex to the container
however to make a grid out of flex
items we need to use the flex
properties in the items.

.container {
display: grid;
}
Grid Layout
With CSS Grid Layout we create the
grid on the parent element. We don’t
need to add properties to the items.

Grid is all about the container

Grid or Flexbox
… and that’s just the start
‣ Grid allows you to layer items, or for two items to occupy
the same space
‣ Grid allows full control of negative space in your designs
‣ Grid has methods such as the dense packing mode to
backﬁll gaps in a tight-packed grid

Flexbox or Grid?
Use Flexbox when …
‣ Your content is a row OR a column
‣ You want the size of items to dictate their layout
‣ You want to distribute space

Flexbox or Grid?
Consider grid when …
‣ You need to control rows and columns
‣ You are adding widths to a ﬂex item in order to make it
line up with rows above.
‣ You want control of the layout from the parent
‣ Items need to occupy the same space or overlap

Using grid in
production
CSS Grid Layout

<div class="box-feature">
<img class="box-image" src="http://placehold.it/
900x450" alt="placeholder">
<h2 class="box-feature-title">Featured Item</h2>
<div class="box-content">…</div>
</div>
Feature box
The feature has an image with a
heading and body text overlaid.

.box-feature {
display: grid;
grid-gap: 20px;
grid-template-columns: repeat(6, 1fr);
}
Feature box
display: grid turns on grid layout
grid-gap deﬁnes gutters between
grid items
grid-template-columns creates
column tracks. In this case creating a
grid with 6 equal columns.

The fr unit deﬁnes a fraction of the
available space in the grid container

.box-feature .box-image {
align-self: stretch;
justify-self: stretch;
grid-column: 1 / -1;
grid-row: 1 / 4;
}
Feature box
The image starts at grid column  
line 1 and ends at -1, which is the end
line.
It starts at grid row 1, ending at grid
row 4.
Using box alignment properties to
stretch the image over that area.

Grid lines respect writing mode.
Column line 1 is on the left and -1 on
the right in a LTR language.

Explicit vs. Implicit Grid
▸ The Explicit Grid is created when you deﬁne tracks with grid-template-
columns and grid-template-rows
▸ If you place an item outside of that grid, or auto-placed content requires
further row or column tracks these are added by grid as the Implicit Grid.

.box-feature .box-feature-title {
grid-row: 1;
background-color: rgba(0,0,0,0.7);
color: #fff;
align-self: start;
padding: 20px;
}
.box-feature .box-content {
grid-row: 2;
background-color: rgba(0,0,0,0.7);
color: #fff;
padding: 20px;
}
Feature box
Positioning the content inside the
area that the image is stretched over.

http://codepen.io/rachelandrew/pen/evQjMx

Layering items on the grid
▸ You can position items into the same grid cells
▸ Items further down in the source appear on top of earlier items
▸ Control the stack using z-index

.listing {
display: grid;
grid-template-columns: repeat(12,1fr);
grid-gap: 20px;
}
The listing
The container for our boxes has 12
equal columns.

.box-title {
grid-column: 1 / 4;
grid-row: 1 / 2;
}
.box-feature {
grid-row: 1 / 2;
}
The listing
Positioning the title top left and the
feature top right

.box-newer {
grid-column: auto / span 4;
}
.box-newer.box-media {
grid-row-end: span 2;
}
Larger boxes
Newer items span 4 column tracks. If
they also have a class of box-media
they span 2 row tracks.

.box-older {
}
Smaller boxes
The boxes for older items span 3
tracks.

http://codepen.io/rachelandrew/pen/Opaopw

.box-title {
grid-row: 1;
}
@media all and (min-width: 53.125em) {
.box-title {
grid-column: 1 / 6;
grid-row: 1 / 3;
}
}
@media all and (min-width: 75em) {
.box-title {
grid-column: 1 / 4;
grid-row: 1 / 2;
}
}
Going responsive
Inside media queries we can redeﬁne
where items sit on the grid.

.box-newer {
}
.box-newer {
}
}
.box-newer {
}
}
Going responsive
Or redeﬁne how many columns they
span.

http://codepen.io/rachelandrew/pen/gmQdgz

What about
old browsers?
CSS Grid Layout

What about old browsers?
If using display: grid on a container, child items:
‣ Using float, lose their float behaviour
‣ The vertical-align property has no effect
‣ Flex items become grid items
‣ Items set to display: block or inline-block become grid
items
‣ Items set to display: table-cell stop creating anonymous
boxes

You do not need to build “two
layouts”

.listing {
display: flex;
flex-wrap: wrap;
margin: 0 20px;
display: grid;
grid-template-columns: repeat(12,1fr);
grid-gap: 20px;
}
.listing > * {
flex: 1 1 30%;
margin: 0 20px 20px 20px;
}
Adding a flex fallback
Browsers that support display: flex
and not grid will turn the children into
flex, not grid, items.
The flex properties applied to those
items will be ignored by grid layout.

Feature Queries are your new best
friend

.listing > * {
flex: 1 1 30%;
margin: 0 20px 20px 20px;
}
@supports(display: grid) {
.listing > * {
margin: 0;
}
}
Using feature queries
Add a margin for ﬂex layout, remove it
if we are using grid layout.

.listing .box-feature {
flex: 1 1 60%;
}
Flex layout
Give the feature box a larger ﬂex-
basis percentage.

http://codepen.io/rachelandrew/pen/jBQpXv

.grid > div {
float: left;
}
.grid {
display: grid;
grid-gap: 10px;
grid-template-columns: repeat(3, auto);
width: 500px;
}
Float and Clear
The ﬂoat and clear properties have
no eﬀect on a grid item. 
 
https://codepen.io/rachelandrew/pen/YZeqZv

.grid > div {
}
.grid {
display: grid;
grid-gap: 10px;
width: 500px;
}
display: inline-block
The properties associated with
something being inline-block cease
to apply. 
 
https://codepen.io/rachelandrew/pen/vxdGjQ

.grid > div {
display: table-cell;
vertical-align: top;
}
.grid {
border-spacing: 10px;
}
.grid {
display: grid;
grid-gap: 10px;
width: 500px;
}
display: table
Anonymous boxes will not be
generated and the item will become a
grid item. 
 
https://codepen.io/rachelandrew/pen/bqLpQN

.grid > div {
vertical-align: top;
}
.grid {
display: grid;
grid-gap: 10px;
width: 500px;
}
The vertical-align property
Can be used as a fallback for box
alignment and ceases to apply on grid
items. 
 
https://codepen.io/rachelandrew/pen/vxdGaQ

.grid {
column-count: 3;
width: 500px;
}
.grid {
display: grid;
grid-gap: 10px;
}
Multiple-column layout
Multiple-column layout properties
cease to apply in grid layout. 
 
https://codepen.io/rachelandrew/pen/JWpXxv

.grid {
display: flex;
align-items: center;
width: 500px;
height: 200px;
border: 1px dotted #694486;
}
.grid > div {
flex: 1;
}
.grid {
display: grid;
grid-gap: 10px;
}
Flex layout
Grid will override ﬂex layout and
shares box alignment properties. 
 
https://codepen.io/rachelandrew/pen/YZeqMB

Overrides inside @supports are
mostly widths & margins

* { box-sizing: border-box; }
.grid > div {
float: left;
width: 33.333%;
}
@supports (display: grid) {
.grid > div {
width: auto;
}
}
.grid {
display: grid;
grid-gap: 10px;
grid-template-columns: repeat(3, 1fr);
width: 500px;
}
Override widths in feature queries
Watch out for widths in your fallback
layouts. 
 
https://codepen.io/rachelandrew/pen/JWpXNr

https://rachelandrew.co.uk/css/cheatsheets/grid-fallbacks

Edge Grid implementation
▸ Currently tied to the IE10 implementation
▸ Preﬁxed with -ms
▸ No auto-placement or grid-template-areas layout
▸ For simple line-based positioning it works
▸ More at https://rachelandrew.co.uk/archives/2017/04/04/edge-starts-work-
on-their-grid-implementation-update/

Let browser vendors know which
features you want.

https://wpdev.uservoice.com/forums/257854-microsoft-edge-developer/

https://developer.microsoft.com/en-us/microsoft-edge/platform/usage/

http://codepen.io/rachelandrew/pen/YqpRdq/

.exclusion {
-ms-wrap-flow: both;
wrap-flow: both;
}
Exclusions
Deﬁnes the wrap-ﬂow property,
which enables wrapping content
round all sides of an element.

https://www.chromestatus.com/features/6296903092273152

You can get involved in the future of
CSS.

https://github.com/w3c/csswg-drafts/issues

https://github.com/w3c/csswg-drafts/issues/499

Get involved with CSS
▸ Comment on or raise new issues against CSS speciﬁcations
▸ Raise bugs against browsers
▸ Vote on features where browsers have a platform to do so
▸ Write about new features - it demonstrates we want them
▸ Be nice while doing it. Browser engineers and spec editors work within
constraints just as you do in your projects.

Find out more
I made you some resources
Visit Grid by Example for worked examples, and a free video
tutorial: 
http://gridbyexample.com
I created a huge set of guides for MDN:  
https://developer.mozilla.org/en-US/docs/Web/CSS/
CSS_Grid_Layout
Over 4 years of grid thoughts on my site at: 
https://rachelandrew.co.uk/archives/tag/cssgrid

THANK YOU!
@rachelandrew 
 
Talk resources & code: https://rachelandrew.co.uk/speaking/event/smashingsf-2017

Grid and Flexbox - Smashing Conf SF

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