🧵 Two of my most- and first-used checks when doing a performance audit are surprisingly old school: 1) Validate HTML 2) Disable JS.

Validate HTML? Yep. We haven’t really cared about ‘valid HTML’ for valid HTML’s sake for about a decade, but certain errors can actually be pretty significant. What’s wrong with this picture?
It’s this lil’ fella right here. isn’t allowed in the , so when the browser encounters the , it assumes the should have been closed already.
This is a feature. This is what allows us to omit certain closing tags like

, , , and—you guessed it!—. The appearance of certain opening tags implies the closing of certain preceding ones.
The practical upshot of which is that non- elements early-terminate the tags, pushing all of your important resources into the . Oops!
Disable JavaScript? I think building sites for people who’ve turned JS off is an expensive waste of time: they’ve turned it off! Leave them to it. But! I do feel it’s vital that we can fail reasonably elegantly when JS fails (and it will).
I strongly hold @adactio and @jaffathecake’s respective (and paraphrased) opinions about JS: ‘How well does it fail?’ and ‘All your users are non-JS until your JS is downloaded and run’.
From a performance perspective, I don’t want to see your core content buried away in JS. JS is slower than HTML. If you need JS to display core content, you’re on the slow path. The quickest way for me to ascertain whether content is coming out of JS? Disable it!
Do I care that CNN doesn’t work with JS disabled? Not necessarily. But immediately I can see that their content is reliant on the successful download and execution of JS. This is always going to be slower than having it in the HTML—the first (and successful) response.

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Once upon a time there was a Raja named Uttānapāda born of Svayambhuva Manu,1st man on earth.He had 2 beautiful wives - Suniti & Suruchi & two sons were born of them Dhruva & Uttama respectively.
#talesofkrishna https://t.co/E85MTPkF9W


Now Suniti was the daughter of a tribal chief while Suruchi was the daughter of a rich king. Hence Suruchi was always favored the most by Raja while Suniti was ignored. But while Suniti was gentle & kind hearted by nature Suruchi was venomous inside.
#KrishnaLeela


The story is of a time when ideally the eldest son of the king becomes the heir to the throne. Hence the sinhasan of the Raja belonged to Dhruva.This is why Suruchi who was the 2nd wife nourished poison in her heart for Dhruva as she knew her son will never get the throne.


One day when Dhruva was just 5 years old he went on to sit on his father's lap. Suruchi, the jealous queen, got enraged and shoved him away from Raja as she never wanted Raja to shower Dhruva with his fatherly affection.


Dhruva protested questioning his step mother "why can't i sit on my own father's lap?" A furious Suruchi berated him saying "only God can allow him that privilege. Go ask him"
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