ct.css — Efficiency Hints by way of Injected Stylesheet Alone

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That is some bonafide CSS trickery from Harry that offers you some generic efficiency recommendation primarily based on what it sees in your <head> component.

First, it’s attainable to make a <fashion> block seen like some other component by altering the show away from the default of none. It’s a pleasant little trick. You possibly can even try this for issues within the <head>, for instance…

head,
head fashion,
head script {
show: block;
}

From there, Harry will get very intelligent with selectors, figuring out problematic conditions from the utilization and placement of sure tags. For instance, say there’s a <script> that comes after some kinds…

<head>
<hyperlink rel=”stylesheet” href=”…”>
<script src=”…”></script>
<title>Web page Title</title>
<!– … –>

Properly, that’s unhealthy, as a result of the script is blocked by CSS seemingly unnecessarily. Maybe some refined efficiency tooling software program might inform you that. However you understand what else can? A CSS selector!

head [rel=”stylesheet”]:not([media=”print”]):not(.ct) ~ script,
head fashion:not(:empty) ~ script {

}

That’s kinda like saying head hyperlink ~ script, however slightly fancier in that it solely selects precise stylesheets or fashion blocks which can be actually blocking (and never itself). Harry then applies styling and pseudo-content to the blocks so you should utilize the stylesheet as a visible efficiency debugging software.

That’s simply darn intelligent, that. The stylesheet has a great deal of little issues you’ll be able to take a look at for, like attributes you don’t want, blocking sources, and parts which can be out of order.

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