Pen Settings

HTML

CSS

CSS Base

Vendor Prefixing

Add External Stylesheets/Pens

Any URL's added here will be added as <link>s in order, and before the CSS in the editor. If you link to another Pen, it will include the CSS from that Pen. If the preprocessor matches, it will attempt to combine them before processing.

+ add another resource

JavaScript

Babel includes JSX processing.

Add External Scripts/Pens

Any URL's added here will be added as <script>s in order, and run before the JavaScript in the editor. You can use the URL of any other Pen and it will include the JavaScript from that Pen.

+ add another resource

Packages

Add Packages

Search for and use JavaScript packages from npm here. By selecting a package, an import statement will be added to the top of the JavaScript editor for this package.

Behavior

Save Automatically?

If active, Pens will autosave every 30 seconds after being saved once.

Auto-Updating Preview

If enabled, the preview panel updates automatically as you code. If disabled, use the "Run" button to update.

Format on Save

If enabled, your code will be formatted when you actively save your Pen. Note: your code becomes un-folded during formatting.

Editor Settings

Code Indentation

Want to change your Syntax Highlighting theme, Fonts and more?

Visit your global Editor Settings.

HTML

              
                <header>
	<h2>Отфильтруйте так. чтобы остались только красные блоки:</h2>
	<button id="filter">Оставить красные блоки</button>
</header>


<div class="row">
	<div class="item red"></div>
	<div class="item green"></div>
	<div class="item green"></div>
	<div class="item blue"></div>
	<div class="item red"></div>
	<div class="item red"></div>
	<div class="item green"></div>
	<div class="item red"></div>
	<div class="item blue"></div>
	<div class="item blue"></div>
	<div class="item red"></div>
	<div class="item green"></div>
</div>
              
            
!

CSS

              
                @import 'nib'

reset()
	display block
	margin 0
	padding 0
	box-sizing border-box

.hide
	display none !important

header
	text-align center
	padding-bottom 25px

.green
	background teal
.red
	background tomato
.blue
	background skyblue

.row
	reset()
	clearfix()
	width 650px
	margin auto
.item
	reset()
	float left
	height 100px
	width 200px
	margin-bottom 10px
	&:nth-child(3n+2)
		margin-right 25px
		margin-left 25px
              
            
!

JS

              
                $('#filter').on('click', ()=> {
	$('.item').addClass('hide');
	$('.red').removeClass('hide');
});
              
            
!
999px

Console