SLDS and
Lightning
Components
Stephanie Rewis
Lead Developer, Design Systems
@stefsull
Greg Rewis
Principal Developer Evangelist
@garazi
Forward Looking Statement
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Why did Salesforce need a Design System?
Lightning Experience
Hundreds of Developers
Small Team of Designers
Smaller Design Systems Team
How can my app
look like this?
Can I use the CSS in
my app?
Lightning Design System
The next generation of living style guides
Design System
Components
CSS Framework + UI Library
Design audit and inventory 

of all components in designer's
comps
Border Colors
Shadows
Spacing
Sizing
Animation Durations
Media Queries
z-indexes
Some Design Token Properties
Fonts
Font Sizes
Font Weights
Line Heights
Background Colors
Text Colors
.lookup__menu {
position: absolute;
margin-top: t(spacingXxSmall);
border: t(borderWidthThin) solid t(colorBorder);
border-radius: t(borderRadiusMedium);
padding: t(spacingXxSmall) 0;
background: t(colorBackgroundAlt);
z-index: t(zIndexDropdown);
}
We broke the components
down to their smallest patterns
and objects.
SLDS Micropatterns
/components/utilities/lists#flavor-vertical-dividers
/components/utilities/lists#flavor-vertical-dividers
/components/utilities/lists#flavor-horizontal-dividers
Block
Element
Modifier
BEM Naming Convention
Let’s build a house!
.house
block or component name
.house__door

.house__window
element or component part
.house--gray
modifier or component variation
.house__door--fuschia
variation of a component part
Flexbox
CSS box model optimized for user interface design.
The SLDS grid system provides a flexible, mobile-first, device-
agnostic scaffolding system
The SLDS grid system provides a flexible,
mobile-first, device-agnostic scaffolding system
/components/utilities/grid/
Advantages of Flexbox Grids
Automatic Sizing 

Lowers the bar for error. Great for component layouts.

Manual Sizing

Great for page layouts and responsive design.

Direction can be Manipulated

Your content can flow from left to right, top to bottom, right to left, bottom to top.

Nested Grids

Nest grids inside grids. It’s fast and efficient.
<div	
  class="slds-­‐grid">	
  
	
  	
  	
   	
   	
   	
   	
   	
   …	
  
</div>
<ul	
  class="slds-­‐grid">	
  
	
  	
  	
   	
   	
   	
   	
   	
   …	
  
</ul>
<span	
  class="slds-­‐grid">	
  
	
  	
  	
   	
   	
   	
   	
   	
   …	
  
</span>
Extensible
We provide a library of helpers that can modify the grid container or
individual grid regions.

We use verbose, human-readable classes.
<div	
  class="slds-­‐grid	
  slds-­‐grid-­‐-­‐vertical">	
  
…	
  
</div>
<div	
  class="slds-­‐grid	
  slds-­‐grid-­‐-­‐vertical">	
  
…	
  
</div>
Flex-wrap
.slds-wrap { // This is placed on the .grid container
flex-wrap: wrap;
align-items: flex-start
}
<ul	
  class="slds-­‐grid">	
  
...	
  
<li>...</li>	
  
<li>...</li>	
  
...	
  
</ul>
<ul	
  class="slds-­‐grid">	
  
...	
  
<li	
  class="slds-­‐col">...</li>	
  
<li	
  class="slds-­‐col">...</li>	
  
...	
  
</ul>
<ul	
  class="slds-­‐grid">	
  
...	
  
<li	
  class="slds-­‐col">...</li>	
  
<li	
  class="slds-­‐col">...</li>	
  
...	
  
</ul>
<ul	
  class="slds-­‐grid">	
  
...	
  
<li	
  class="slds-­‐col">...</li>	
  
<li	
  class="slds-­‐col	
  slds-­‐no-­‐flex">...</li>	
  
...	
  
</ul>
<ul	
  class="slds-­‐grid">	
  
...	
  
<li	
  class="slds-­‐col">...</li>	
  
<li	
  class="slds-­‐col	
  slds-­‐no-­‐flex">...</li>	
  
...	
  
</ul>
Sizing Helpers
Support for 2,3,4,5,6,8, & 12 Column Grids.
<...class="slds-­‐size-­‐-­‐1-­‐of-­‐3">	
  
<...class="slds-­‐size-­‐-­‐1-­‐of-­‐3">	
  
Column span numerator.
<...class="slds-­‐size-­‐-­‐1-­‐of-­‐3">	
  
Human friendly delimiter.
<...class="slds-­‐size-­‐-­‐1-­‐of-­‐3">	
  
Total column denominator.
.slds-­‐size-­‐-­‐1-­‐of-­‐3	
  {	
  
width:	
  33.3333333333%;	
  
}	
  
	
  	
  	
   	
   	
   	
   	
   Output
Responsive Sizing Helpers
Sizing helpers have responsive technology baked into them
/components/utilities/sizing/
Mobile first approach
All responsive classes are additive.
Breakpoint Names:
x-small = Small phone
small = Phone
medium = Tablet
large = Desktop
<...class="slds-­‐large-­‐size-­‐-­‐1-­‐of-­‐3">	
  
<...class="[default]	
  [x-­‐small-­‐override]	
  [small-­‐override]	
  [medium-­‐override]	
  [large-­‐override]">
<...class="slds-­‐size-­‐-­‐1-­‐of-­‐1	
  slds-­‐small-­‐size-­‐-­‐1-­‐of-­‐2	
  slds-­‐medium-­‐size-­‐-­‐1-­‐of-­‐4">
100% width up to phone
50% width in between a phone and tablet
25% width on tablet and up (desktop)
<div	
  class="slds-­‐grid	
  slds-­‐wrap">	
  
<div	
  class="slds-­‐size-­‐-­‐1-­‐of-­‐1	
  slds-­‐small-­‐size-­‐-­‐1-­‐of-­‐2	
  slds-­‐medium-­‐size-­‐-­‐1-­‐of-­‐4">…</div>	
  
<div	
  class="slds-­‐size-­‐-­‐1-­‐of-­‐1	
  slds-­‐small-­‐size-­‐-­‐1-­‐of-­‐2	
  slds-­‐medium-­‐size-­‐-­‐1-­‐of-­‐4">…</div>	
  
<div	
  class="slds-­‐size-­‐-­‐1-­‐of-­‐1	
  slds-­‐small-­‐size-­‐-­‐1-­‐of-­‐2	
  slds-­‐medium-­‐size-­‐-­‐1-­‐of-­‐4">…</div>	
  
<div	
  class="slds-­‐size-­‐-­‐1-­‐of-­‐1	
  slds-­‐small-­‐size-­‐-­‐1-­‐of-­‐2	
  slds-­‐medium-­‐size-­‐-­‐1-­‐of-­‐4">…</div>	
  
</div>
Mobile:
Tablet:
Desktop:
bit.ly/1lJTr3z
Codepen Responsive Grid Example
• Lightning Component in Lightning Experience
• Lightning Component in Visualforce
• Lightning Component in a Lightning App
• Lightning Component in Lightning Out
Lightning Components and SLDS
Lightning Component in Lightning Experience
<ltng:require />
• Lightning Component in Visualforce
• Lightning Component in a Lightning App
• Lightning Component in Lightning Out
Lightning Components and SLDS
<ltng:require
styles="/resource/myScope/assets/styles/salesforce-lightning-design-system.css"
/>
<div class=“myScope”>
// your components/markup here
</div>
• Lightning Component in Visualforce
• Lightning Component in a Lightning App
• Lightning Component in Lightning Out
Lightning Components and SLDS
<ltng:require
styles="/resource/myScope/assets/styles/salesforce-lightning-design-system.css"
/>
<div class=“myScope”>
// your components/markup here
</div>
Scoping SLDS in Lightning Components
https://tools.lightningdesignsystem.com/css-customizer
Demo
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SLDS and Lightning Components