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The sum $\textstyle \sum _{i=0}^{\infty }2^{-i}$ converges to

something so that the line width is fine. This example should be written as

<math display="inline">\sum_{i=0}^\infty 2^{-i}</math>

The convention https://en.wikipedia.org/wiki/Wikipedia:Manual_of_Style_(mathematics)#Using_HTML is really annoying.

display

called the

${\text{geometric series:}}\quad {\begin{aligned}\sum _{i=0}^{\infty }2^{-i}=2\end{aligned}}$

should be able to be written as

:<math display="block">\text{geometric series:}\quad \sum_{i=0}^\infty 2^{-i}=2 </math>

tidy-test

foo

bar

The header	remains visible
This content	is hidden
at first	load time

Title 1

Hello world.

Title 2

Hello world.

$a+b+c$