explain xkcd:User: Aprilfoolsupdate!

Wow what? I can create my user page now! Yay! (And don’t edit my user page)
About me: basic knowledge of html, nothing else
My signature: ^April_fools^update!(talk)
I like my signature, don’t touch it.

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Leaderboard for top 50:

Aprilfoolsupdate!
Aprilfoolsupdate!
Born date	Not telling
Planet	Earth [citation needed]
Language	English
Stellar system	The solar system

Last 7 days (Top 50)

Rank Score Pages Changes Username 1 5,253 5,238 5,298 DollarStoreBa'al 2 1,848 1,831 1,907 Victoria 3 23 18 24 TheusafBOT 4 11 5 13 Trimutius 5 10 7 10 FaviFake 6 9 6 8 Utdtutyabthsc 7 8 5 8 Lp0 on fire 8 7 5 6 R128 9 7 2 8 boB 10 6 3 5 BunsenH 11 5 3 4 Mathmaster 12 4 1 4 NotBob 13 4 2 3 Fephisto 14 4 2 3 Barry Margolin 15 3 1 2 Beechmere 16 3 1 2 TheSeventhElectron 17 3 1 2 Kynde 18 3 1 2 Paul 19 3 3 3 Batbrain55 20 3 3 3 Starnote 21 3 1 2 Stephan Leeds 22 3 1 2 Questioner 23 3 3 3 KelOfTheStars! 24 3 1 2 Kirinhatchi 25 2 2 2 AgentMuffin 26 2 2 2 August Fuller 27 2 2 2 Theusaf 28 2 2 2 RadiantRainwing 29 1 1 1 StepSquadStepped 30 1 1 1 Magtei 31 1 1 1 183231bcb 32 1 1 1 Ardub 33 1 1 1 Cobl703 34 1 1 1 Michael Valler 35 1 1 1 Frigidus08 36 1 1 1 DKMell 37 1 1 1 Neike Taika-Tessaro 38 1 1 1 Geometrist 39 1 1 1 Coconut Galaxy 40 1 1 1 GreatWyrmGold 41 1 1 1 CalibansCreations 42 1 1 1 Bdentremont 43 1 1 1 LazyTiger0203 44 1 1 1 I’m gonna fix this 45 1 1 1 David Garfield 46 1 1 1 Hellousern 47 1 1 1 Not without text 48 1 1 1 Nvidietha 49 1 1 1 1234231587678