Generate wrong markdown headers for the preview of README.md

[killxin]

When I use it to generate the markdown file for the preview of README.md,

I get the following result. Everything goes well except the Installation header. It includes some unnecessary data, e.g. the <svg...> tag.

# Copy it as markdown

 Copy your selected text or page link in browser and turn it into markdown snippet!

[![Menu usage](</nettee/copy-it-as-markdown/raw/master/img/menu-usage.jpg>)](</nettee/copy-it-as-markdown/blob/master/img/menu-usage.jpg>)

## [<svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg>

](<#installation>)Installation

- Download the latest release [here](<https://github.com/nettee/copy-it-as-markdown/releases>), and unpack it.
- Open *extensions* page chrome://extensions/ in Chrome.
- Toggle on **Developer mode** on top right.
- Click **Load unpacked extension** and choose the unpacked directory.

[nettee]

It seems that if we remove the [<svg ...](...) part, all the results come as expected.

[nettee]

Reproduce this problem:

HTML:

<h1>Copy it as markdown</h1>
<p>Copy your selected text or page link in browser and turn it into markdown snippet!</p>
<p><a target="_blank" rel="noopener noreferrer" href="/nettee/copy-it-as-markdown/blob/master/img/menu-usage.jpg"><img src="/nettee/copy-it-as-markdown/raw/master/img/menu-usage.jpg" alt="Menu usage" style="max-width:100%;"></a></p>
<h2><a id="user-content-installation" class="anchor" aria-hidden="true" href="#installation"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Installation</h2>
<ul>
<li>Download the latest release <a href="https://github.com/nettee/copy-it-as-markdown/releases">here</a>, and unpack it.</li>
<li>Open <em>extensions</em> page chrome://extensions/ in Chrome.</li>
<li>Toggle on <strong>Developer mode</strong> on top right.</li>
<li>Click <strong>Load unpacked extension</strong> and choose the unpacked directory.</li>
</ul>
<h2><a id="user-content-usage" class="anchor" aria-hidden="true" href="#usage"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Usage</h2>
<p>Right-click on your web page to use it!</p>

Markdown:

# Copy it as markdown

 Copy your selected text or page link in browser and turn it into markdown snippet!

[![Menu usage](</nettee/copy-it-as-markdown/raw/master/img/menu-usage.jpg>)](</nettee/copy-it-as-markdown/blob/master/img/menu-usage.jpg>)

## [<svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg>

](<#installation>)Installation

- Download the latest release [here](<https://github.com/nettee/copy-it-as-markdown/releases>), and unpack it.
- Open *extensions* page chrome://extensions/ in Chrome.
- Toggle on **Developer mode** on top right.
- Click **Load unpacked extension** and choose the unpacked directory.



## [<svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg>

](<#usage>)Usage

Right-click on your web page to use it!

The GitHub page's source code:

So, the html-to-markdown translating module is okay, but it is unexpected that GitHub inserts <svg> tags before headers.