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<
!DOCTYPE
html
>
<
html
>
<
head
>
<
script
src
="/lib/jquery-1.12.2.min.js"
>
<
/script
>
<
script
>
$(document).ready(
function
(){
$(
":root"
).css(
"background-color"
,
"yellow"
);
});
<
/script
>
<
/head
>
<
body
>
<
h1
>
This is a heading
<
/h1
>
<
/body
>
<
/html
>
<!DOCTYPE html> <html> <head> <script src="/lib/jquery-1.12.2.min.js"></script> <script> $(document).ready(function(){ $(":root").css("background-color", "yellow"); }); </script> </head> <body> <h1>This is a heading</h1> </body> </html>