tags opera 
CSS Wizardry
OCTOBER 12, 2022
There’s no async attribute in sight, and the code itself isn’t doing anything special: it’s just injecting a script that resolves to a regular, blocking tag in the DOM: How is this any different to just loading the file normally? But what is it about this snippet that actually makes the file asynchronous? Where is the magic?!
Smashing Magazine
JUNE 1, 2022
Maciej Kocemba published research findings from Opera that showed that a typical website with ads could be rendered 51% faster if the ads were blocked. By far, the most impactful change you can make is to remove any obsolete, unused, or unnecessary third-party tags from your site. Are you using one (or more than one) tag manager?
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Smashing Magazine
JULY 29, 2019
Chrome devtools screenshot of the DOM, where I’ve expanded one inline style tag. The browser will guess at what the highest priority assets are, but you can provide a resource hint using the <link rel="preload"> tag, instructing the browser to download the asset as soon as possible. Google Homepage — DOM.
CSS Wizardry
NOVEMBER 9, 2018
The same waterfall occurs in Opera and Safari.). The same waterfall occurs in Opera and Safari.). Before: @import url(app.css); …gives: Missing quote marks in our `@import` URLs breaks Chrome’s Preload Scanner (N.B. After: @import url("app.css"); Adding quote marks to our `@import` URLs fixes Chrome’s Preload Scanner (N.B.
Tim Kadlec
JUNE 6, 2018
The watch will also provide a way for you to optimize your layout specifically for the smaller sizes (though I’ll be honest, I question whether we needed a separate meta tag to accomplish this): Now if you want to optimize your content specifically, you’ll need to add yet another meta tag.
Smashing Magazine
MAY 6, 2019
According to the native lazy loading specification (still under development), if you want to lazy load images or iframes using the native lazy loading feature, you would just need to add the loading=lazy attribute on the related tag. <img The same attribute can be applied to iframes. A Little Third-Party Help. <img alt="A lazy image".
Tim Kadlec
APRIL 10, 2012
Test One: Image Tag. The same as with the first test: every browser tested, aside from Opera Mini and Opera Mobile, will download the image. Opera (11.6+). Opera Mini (6.5+). Opera Mobile (11.5). Opera (11.6+). Opera Mini (6.5+). Opera Mobile (11.5). Opera (11.6+). Opera (11.6+).
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