In honor of John Lennon’s birthday here’s a thread of his best and iconic vocals!

Stand by me
Recorded in 1974
Released in 1975
Leave my kitten alone
Recorded 1965
released 1995
Instant Karma!
Recorded January 27 1970
Released February 6 1970
Twist and Shout
Recorded February 11th 1963
Released March 22nd 1963
Mother
Recorded September-October 1970
Released December 28 1970
Come together
Recorded 21-30 july 1969
Released September 26 1969
In my life
Recorded October 18 and 22 1965
Released December 3 1965
Happiness is a warm gun
Recorded September 24-26 1968
Released November 22 1968
Working class hero
Recorded 26 September – 9 October 1970
Released December 11th 1970

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A brief analysis and comparison of the CSS for Twitter's PWA vs Twitter's legacy desktop website. The difference is dramatic and I'll touch on some reasons why.

Legacy site *downloads* ~630 KB CSS per theme and writing direction.

6,769 rules
9,252 selectors
16.7k declarations
3,370 unique declarations
44 media queries
36 unique colors
50 unique background colors
46 unique font sizes
39 unique z-indices

https://t.co/qyl4Bt1i5x


PWA *incrementally generates* ~30 KB CSS that handles all themes and writing directions.

735 rules
740 selectors
757 declarations
730 unique declarations
0 media queries
11 unique colors
32 unique background colors
15 unique font sizes
7 unique z-indices

https://t.co/w7oNG5KUkJ


The legacy site's CSS is what happens when hundreds of people directly write CSS over many years. Specificity wars, redundancy, a house of cards that can't be fixed. The result is extremely inefficient and error-prone styling that punishes users and developers.

The PWA's CSS is generated on-demand by a JS framework that manages styles and outputs "atomic CSS". The framework can enforce strict constraints and perform optimisations, which is why the CSS is so much smaller and safer. Style conflicts and unbounded CSS growth are avoided.