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This document is a notebook and is noted what I learned. If I make some mistakes in my articles, you can email to me. I will appreciate to your helpful reply. This is my email.

The following are syntex testing.

<style>
    * {
        margin: 0;
        padding: 0;
    }

    body > div {
        font-size: 4px;
        color: #fff;
    }
</style>

<script>
    $(document).ready(function(){
        var something = 5;
        if (something == 5){
            console.log('woohoo');
        }
    });
</script>

<section>
    <p>Hello world</p>
</section>

@startuml

  Class Stage
  Class Timeout {
      +constructor:function(cfg)
      +timeout:function(ctx)
      +overdue:function(ctx)
      +stage: Stage
  }
  Stage <|-- Timeout

@enduml

When $$(a \ne 0)$$,there are two solutions to $$(ax^2 + bx + c = 0)$$ and they are $$x = {-b \pm \sqrt{b^2-4ac} \over 2a}.$$

$$(a \ne 0)$$

graph TD;
  A-->B;
  A-->C;
  B-->D;
  C-->D;

$$\frac{n!}{k!(n-k)!} = \binom{n}{k}$$ $$\frac{n!}{k!(n-k)!} = {n \choose k}$$

$$\cfrac{a+\cfrac{a+b}{c}}{c}$$

$$\begin{array}{ll} a & b \\ c & d \end{array}$$ $$\sum_{i=1}^{n} a_i$$ $$\displaystyle\sum_{i=o}^{n} I_n$$ $$\int_{0}^{\infty} e^{-x}dx$$ $$\int\limits_{0}^{\infty} e^{-x},dx$$ $$ {[{-1},{99}]} {[{1000},{-1})} $$ $$ \begin{smallmatrix} a&b \\ c&d \end{smallmatrix} \mathfrak{ABC} a'' \stackrel\frown{abc} \begin{cases} 1 & \text{if } x \geq 0 \\ 0 & \text{if } x < 0 \end{cases} $$ $$ \ddots $$