DevFest Nantes - Start Using CSS Grid Layout today

START USING CSS GRID LAYOUT TODAY
@rachelandrew @ DevFest Nantes

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

March 2017 March 2017 March 2017 March 2017 March 2017 October 2017

Laying out the future with grid and flexbox
▸ 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 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.

.example {
display: flex;
justify-content: space-between;
margin: 30px;
}
Flexbox
Using space-between
https://codepen.io/rachelandrew/pen/rzXXJY

.example {
display: flex;
flex-wrap: wrap;
margin: 30px;
}
.example > div {
flex: 1 1 auto;
}
Flexbox
Allowing items to grow and shrink
from a ﬂex-basis of auto.
https://codepen.io/rachelandrew/pen/MvNNaj

Grid works from the container in

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

.example {
display: grid;
grid-gap: 20px;
grid-template-columns: 2fr 1fr 2fr 1fr;
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.
https://codepen.io/rachelandrew/pen/LjwwgM

.example {
display: grid;
grid-gap: 20px;
grid-template-columns: min-content max-
content fit-content(200px);
margin: 20px;
}
Grid
Key words based on content size,
change the size of the entire track.
- min-content
- max-content
- ﬁt-content
https://codepen.io/rachelandrew/pen/NaLExq

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-template-columns: 1fr 1fr 1fr;
}
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

https://cloudfour.com/thinks/breaking-out-with-css-grid-layout/

.Prose {
display: grid;
grid-template-columns:
[full-start] minmax(1em, 1fr)
[main-start] minmax(0, 40em) [main-end]
minmax(1em, 1fr) [full-end];
}
.Prose > * {
grid-column: main;
}
.Prose-splash {
grid-column: full;
}
Just do this!
Magic occurs.

<div class="grid">
<div>Content</div>
<div class="full">Full width</div>
<div>Content</div>
</div>
My markup
A div containing three direct child
elements, one with a class of ‘full’.

.grid {
display: grid;
grid-gap: 20px;
minmax(1em, 1fr)
minmax(0, 40em)
minmax(1em, 1fr);
}
.grid > * {
grid-column: 2 ;
}
.grid > .full {
grid-column: 1 / 4 ;
}
A grid with 3 column tracks
Using the line numbers to place our
content and full width items.

1 2 3 4
grid-column: 2;
grid-column: 1 / 4;
grid-column: 2;

.grid {
display: grid;
grid-gap: 20px;
}
.grid > * {
grid-column: main-start ;
}
.grid > .full {
grid-column: full-start / full-end;
}
Naming lines on the grid
We can now position the items using
their line names.

full-start main-start main-end full-end

grid-column: main-start;
grid-column: full-start / full-end;
grid-column: main-start;

grid-column: main;
grid-column: full;
grid-column: main;

.grid {
display: grid;
grid-gap: 20px;
}
.grid > * {
grid-column: main;
}
.grid > .full {
grid-column: full;
}
‘main’and‘full’
These line names don’t exist
anywhere in our grid deﬁnition.

https://www.w3.org/TR/css-grid-1/#implicit-named-areas
“Since a named grid area is referenced by the
implicit named lines it produces, explicitly adding
named lines of the same form (foo-start/foo-end)
eﬀectively creates a named grid area. ”

main-start
main-start
main-end
main-end
main

.grid {
display: grid;
grid-gap: 20px;
100px [main-start]
100px 100px 100px [main-end]
100px 100px;
grid-template-rows:
100px [main-start]
100px 100px [main-end] 100px;
}
.item {
grid-area: main;
}
Implicit named areas
Created by having named lines using
an ident with *-start and *-end. 
 
https://codepen.io/rachelandrew/pen/
eWoKmd/

https://www.w3.org/TR/css-grid-1/#line-placement
“Note: Named grid areas automatically generate
implicit named lines of this form, so specifying
grid-row-start: foo will choose the start edge of
that named grid area (unless another line named
foo-start was explicitly speciﬁed before it).”

https://www.w3.org/TR/css-grid-1/#placement-shorthands
“[when using grid-row and grid-column
shorthands] … When the second value is omitted,
if the ﬁrst value is a <custom-ident>, the grid-row-
end/grid-column-end longhand is also set to
that <custom-ident>; otherwise, it is set to auto.”

grid-column: main / main;
grid-column: full / full;
grid-column: main / main;
full fullmain main

https://codepen.io/rachelandrew/pen/xdedMy/

Grid gives us powerful tools to control
layout via the containing element.

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 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
▸ Updated implementation in Windows Insider build - will ship in October
▸ 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/

Autopreﬁxer can add -ms-grid
preﬁxes. This is rarely helpful.

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 5 years of grid thoughts on my site at: 
https://rachelandrew.co.uk/archives/tag/cssgrid
GridBugs! I’m collecting and trying to get ﬁxed interop issues: 
https://github.com/rachelandrew/gridbugs

The New  
CSS Layout
Out now!

THANK YOU!
@rachelandrew 
 
https://rachelandrew.co.uk/speaking/event/gdg-nantes

DevFest Nantes - Start Using CSS Grid Layout today

More Related Content

What's hot

Similar to DevFest Nantes - Start Using CSS Grid Layout today

Recently uploaded

DevFest Nantes - Start Using CSS Grid Layout today