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lines changed Original file line number Diff line number Diff line change @@ -21,7 +21,21 @@ <h2>Update CSS Variables with <span class='hl'>JS</span></h2>
2121 < img src ="https://source.unsplash.com/7bwQXzbF6KE/800x500 ">
2222
2323 < style >
24+ : root {
25+ --base : # ffc600 ;
26+ --spacing : 10px ;
27+ --blur : 10px ;
28+ }
29+
30+ img {
31+ padding : var (--spacing );
32+ background : var (--base );
33+ filter : blur (var (--blur ));
34+ }
2435
36+ .hl {
37+ color : var (--base );
38+ }
2539 /*
2640 misc styles, nothing to do with CSS variables
2741 */
@@ -45,6 +59,15 @@ <h2>Update CSS Variables with <span class='hl'>JS</span></h2>
4559 </ style >
4660
4761 < script >
62+ const inputs = document . querySelectorAll ( '.controls input' )
63+
64+ function handleUpdate ( ) {
65+ const suffix = this . dataset . sizing || ''
66+ // modifying elements styles using setProperty
67+ document . documentElement . style . setProperty ( `--${ this . name } ` , this . value + suffix )
68+ }
69+
70+ inputs . forEach ( input => input . addEventListener ( 'change' , handleUpdate ) )
4871 </ script >
4972
5073</ body >
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