对于同样的问题，我发现的最简单的解决方案是使用一个多行表，只有一行，没有标题(第一列是图像，第二列是文本):

----------------------- ------------------------------------
![Tip](images/tip.png)\ Table multiline text bla bla bla bla
                        bla bla bla bla bla bla bla ... the
                        blank line below is important 

----------------------------------------------------------------

另一种可能工作(PDF)的方法是使用Latex默认的fbox指令:

 \fbox{My text!}

或FancyBox模块获得更高级的功能(和更好看的盒子):http://www.ctan.org/tex-archive/macros/latex/contrib/fancybox。

一行

> hello
> world

你好 世界

多线

方法

> hello
> 
> world (new line)

你好 世界(新线)

方法b

> ```shell
> echo hello
> echo world
> ```

回声你好 呼应世界

截至2021年9月: 这里有一种方法建立一个文本框在markdown使用html div标签和类'warning'。它在Jupyter Notebook和Typora上工作得很好。 您可以修改背景和字体颜色。

<div class="warning" style='padding:0.1em; background-color:#E9D8FD; color:#69337A'>
<span>
<p style='margin-top:1em; text-align:center'>
<b>On the importance of sentence length</b></p>
<p style='margin-left:1em;'>
This sentence has five words. Here are five more words. Five-word sentences are fine. But several together bocome monotonous. Listen to what is happening. The writing is getting boring. The sound of it drones. It's like a stuck record. The ear demands some variety.<br><br>
    Now listen. I vary the sentence length, and I create music. Music. The writing sings. It has a pleasent rhythm, a lilt, a harmony. I use short sentences. And I use sentences of medium length. And sometimes when I am certain the reader is rested, I will engage him with a sentence of considerable length, a sentence that burns with energy and builds with all the impetus of a crescendo, the roll of the drums, the crash of the cymbals -- sounds that say listen to this, it is important.
</p>
<p style='margin-bottom:1em; margin-right:1em; text-align:right; font-family:Georgia'> <b>- Gary Provost</b> <i>(100 Ways to Improve Your Writing, 1985)</i>
</p></span>
</div>

或者(在设计上增加一点——圆角和边框)

<div class="warning" style='background-color:#E9D8FD; color: #69337A; border-left: solid #805AD5 4px; border-radius: 4px; padding:0.7em;'>
<span>
<p style='margin-top:1em; text-align:center'>
<b>On the importance of sentence length</b></p>
<p style='margin-left:1em;'>
This sentence has five words. Here are five more words. Five-word sentences are fine. But several together bocome monotonous. Listen to what is happening. The writing is getting boring. The sound of it drones. It's like a stuck record. The ear demands some variety.<br><br>
    Now listen. I vary the sentence length, and I create music. Music. The writing sings. It has a pleasent rhythm, a lilt, a harmony. I use short sentences. And I use sentences of medium length. And sometimes when I am certain the reader is rested, I will engage him with a sentence of considerable length, a sentence that burns with energy and builds with all the impetus of a crescendo, the roll of the drums, the crash of the cymbals -- sounds that say listen to this, it is important.
</p>
<p style='margin-bottom:1em; margin-right:1em; text-align:right; font-family:Georgia'> <b>- Gary Provost</b> <i>(100 Ways to Improve Your Writing, 1985)</i>
</p></span>
</div>

这是一个简单的基于乳胶的例子。

---
header-includes:
    - \usepackage[most]{tcolorbox}
    - \definecolor{light-yellow}{rgb}{1, 0.95, 0.7}
    - \newtcolorbox{myquote}{colback=light-yellow,grow to right by=-10mm,grow to left by=-10mm, boxrule=0pt,boxsep=0pt,breakable}
    - \newcommand{\todo}[1]{\begin{myquote} \textbf{TODO:} \emph{#1} \end{myquote}}
---

blah blah

\todo{something}

blah

结果是:

不幸的是，因为这是latex，所以你不能再在TODO框中包含markdown(通常这不是一个大问题)，并且当转换为PDF以外的格式(例如html)时，它将不起作用。

你试过使用双标签吗?做一个盒子:

Start on a fresh line
Hit tab twice, type up the content
Your content should appear in a box

它在带有html输出的常规Rmarkdown文档中为我工作。双选项卡部分应该出现在一个圆角矩形浅灰色框中。

另一个解决方案是使用CSS邻接并使用h4(或更高):

#### note

This is the note content

h4 {
  display: none; /* hide */
}

h4 + p {
  /* style the note however you want */
}