Top #trick dweets

function u(t) {

c.width=1920 // clear the canvas
for(i=0;i<9;i++)
x.fillRect(400+i*100+S(t)*300,400,50,200) // draw 50x200 rects

} // 122/140

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    u(t) is called 60 times per second.
    t: Elapsed time in seconds.
    S: Shorthand for Math.sin.
    C: Shorthand for Math.cos.
    T: Shorthand for Math.tan.
    R: Function that generates rgba-strings, usage ex.: R(255, 255, 255, 0.5)
    c: A 1920x1080 canvas.
    x: A 2D context for that canvas.

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prplz

function u(t) {

for(c.width|=i=9;i--;)x.fillRect(400+i*100+S(t)*300,400,50,200)















x.font='60em a',t&8&&x.fillText('👻',350+t**4%33,900+t**4%29)

Oct 11 2018 3:22 AM UTC

}// 139/140

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#default

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u/firegodjr

I WAS UNPREPARED
u/SuperFromND

ABSOLUTELY SPOOPED
u/Purpzie

WHEEZE
u/katkip

haha genius #scary
u/f8f82804

#halloween #trick
u/aleamb

lol
u/donbright

hahaa
u/iverjo

xD
u/joeytwiddle

#waitforit

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tomxor

function u(t) {

t>1&&eval('U='+parent[c.style=9*u.r|reset()].u);U(t);if(t%1>.8)for(c.width=128,i=1e4;i--;)x.fillRect(i&127,0|i/120-t*4,1,u.r=Math.random())

Mar 13 2020 1:15 AM UTC

}// 139/140

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Dwitter Vision

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u/Xen

love the idea
u/DaSpider

ReferenceError: U is not defined
u/KilledByAPixel

how is this possible?
u/tomxor

All loaded iframes are enumerated on the window object (for any webpage), the value is the window object of the corresponding frame... and from inside a dweet this can be accessed (with restrictions) by going to the parent frame, then you have access to any globals in that other frame. While you can't call a function since it's in a different JS context, you can read it's source and re-evaluate it.
u/tomxor

essentually window.parent[n].u is the function created by dwitter for dweet n on the page, if you add it to a string it calls toString which returns the source, you can eval this and assign it to something to run in this context.
u/tomxor

I think I am the most verbose person here sorry :/
u/jellyedwards

Wow that's amazing!
u/jellyedwards

Very nice presentation of that little trick
u/katkip

nice trickery. #exploit #trick #hack
u/sigveseb

Woah

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magna

function u(t) {

T.valueOf=Math.random
x.setTransform(T,T,T,T,T,T)
x.fillStyle=R(0,0,0,T)
x.fillRect(999,999,99,99)

Jun 6 2018 3:45 PM UTC

}// 98/140

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Proof-of-concept of using valueOf to prevent function call parenthesis (()) to save space when a function is used at least 5 times.

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katkip

function u(t) {

pauseDemo=null;receiveMessage=null;playing=true;x.font='5cm A';x.fillText("Try to comment!",340,600);throw `
`.repeat(Math.abs(S(t*6)*10))

Aug 28 2018 2:38 PM UTC

}// 138/140

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Comment #interactive #game !! Try to comment without scrolling down! It is #genius. It was a challenge for me too writing this comment lmao

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u/BirdsTweetCodersDweet

lmao... this probably shouldn't be allowed
u/katkip

Wait I just realised you can't read that lol
u/f8f82804

Holy heck this is clver and annoying
u/firegodjr

I hate it xD
u/joeytwiddle

lol #trick
u/magna

HAX
u/username

annoying
u/robalb

lol
u/d0n.key

wow
u/Iceland_jack

see
u/rnbw

i got a hold on it! :D
u/aaaaaz

aaaa

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katkip

function u(t) {

/*‮*/eval(atob`dHx8KHM9Ii4iKTtzKz1TdHJpbmcuZnJvbUNoYXJDb2RlKDc4MCtNYXRoLnJhbmRvbSgpKjUwKTt0aHJvdyBz`)

Oct 12 2019 1:26 PM UTC

}// 101/140

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akm

function u(t) {

c.width|="‮";for(i=9;i--;)x.fillRect(400+i*100+S(t)*300,400,50,200)

Feb 13 2018 3:07 PM UTC

}// 67/140

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u/loni_art

haha what?
u/aleamb

WTF! lol!
u/magna

WAT
u/Paisley

lol, what even is this voodoo
u/akm

might have gotten the idea from here... https://securelist.com/zero-day-vulnerabilit…
u/joeytwiddle

Awesome!
u/iverjo

Interesting hack! Basically, this is c.width|="Right-to-left Override unicode character goes here";for(i=9;i--;)x.fillRect(400+i*100+S(t)*300,400,50,200)
u/akm

u/iverjo exactly! It took me a little while to find a place to put the character and still have valid js
u/joeytwiddle

#trick
u/Purpzie

WOAH. How do you even copy and paste the special character?

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katkip

function u(t) {

/*‫‬‭‮҉*/c.width=1920
/*‫‬‭‮҉*/for(i=0;i<9;i++)
/*‫‬‭‮҉*/x.fillRect(400+i*100+S(t)*300,400,50,200)

Apr 20 2019 1:48 PM UTC

}// 98/140

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#default

u/katkip

#hack #exploit
u/katkip

‮҉ #trick

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rodrigo.siqueira

remix of d/17337 by u/rodrigo.siqueira

function u(t) {

x.font=`${1.85*S(i=t)}in'`
for(k in x)p=P=>255*S(i/P),x.fillStyle=R(p(1)+180,p(.1),p(.2),.02),x.fillText(k,S(i++)*2-9,t*14*i*C(i)+600)

Jan 23 2020 12:31 AM UTC

}// 135/140

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CompositeOperation SmoothingEnabled

u/katkip

#trick

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yonatan

function u(t) {

c.width|=c.innerHTML=`<svg><filter id=f><feMorphology radius=${t} >`;c.style="filter:url(#f)"
x.font='9in x'
x.strokeText('hello',0,1e3)

Oct 25 2018 9:51 PM UTC

}// 136/140

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another filter, pretty useless

u/f8f82804

this is an awesome technique, i'm enjoying watching you explore it!
u/joeytwiddle

#svg #text #trick

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ciaccodavide

function u(t) {

c.width|=1
x.font=`66em impact`
x.fillText(playing?`DON'T LEAVE ME`:' COME BACK',0,940+S(t)*99,1920)

Nov 4 2020 2:53 PM UTC

}// 100/140

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Don't leave me

u/Xen

what is this? fanta!...what is this? stick!....fantastic!!
u/ciaccodavide

:D
u/katkip

WOAAH #trick

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