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{% dplayer "url=https://neroasmar.top/video/christmas.mp4" "pic=" "loop=yes" "theme=#FADFA3" "autoplay=false" "token=tokendemo" %}

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{% aplayer "她的睫毛" "周杰伦" "http://home.ustc.edu.cn/~mmmwhy/%d6%dc%bd%dc%c2%d7%20-%20%cb%fd%b5%c4%bd%de%c3%ab.mp3" "http://home.ustc.edu.cn/~mmmwhy/jay.jpg" "autoplay=false" %}

<iframe frameborder="no" border="0" marginwidth="0" marginheight="0" width=330 height=86 src="//music.163.com/outchain/player?type=2&id=1491585&auto=0&height=66"></iframe>
<iframe src="//player.bilibili.com/player.html?aid=69914393&cid=121140565&page=1&high_quality=1&danmaku=0" scrolling="no" border="0" frameborder="no" framespacing="0" allowfullscreen="true"> </iframe>
$$\begin{equation}
e=mc^2
\end{equation}\label{eq1}$$


The famous matter-energy equation $\eqref{eq1}$ proposed by Einstein...

$$\begin{equation}
\begin{aligned}
a &= b + c \\
&= d + e + f + g \\
&= h + i
\end{aligned}
\end{equation}\label{eq2}$$


Equation $\eqref{eq2}$ is a multi-line equation.

$$\begin{align}
a &= b + c \label{eq3} \\
x &= yz \label{eq4}\\
l &= m - n \label{eq5}
\end{align}$$


There are three aligned equations: equation $\eqref{eq3}$, equation $\eqref{eq4}$ and equation $\eqref{eq5}$.

$$\begin{align}
-4 + 5x &= 2+y \nonumber \\
w+2 &= -1+w \\
ab &= cb
\end{align}$$


$$x+1\over\sqrt{1-x^2} \tag{i}\label{eq_tag}$$

Equation $\eqref{eq_tag}$ use `\tag{}` instead of automatic numbering.

$E=mc^2$

<center>fa</center>