As far as the Markdown syntax is concerned, if you want to get that detailed, you’ll just have to use HTML. <a href=”http://example.com/” target=”_blank”>Hello, world!</a> Most Markdown engines I’ve seen allow plain old HTML, just for situations like this where a generic text markup system just won’t cut it. (The StackOverflow engine, for example.) They … Read more
If you use Markdown (README.md): Provided that you have the image in your repo, you can use a relative URL:  If you need to embed an image that’s hosted elsewhere, you can use a full URL  GitHub recommend that you use relative links with the ?raw=true parameter … Read more
TL;DR Markdown doesn’t support color but you can inline HTML inside Markdown, e.g.: <span style=”color:blue”>some *blue* text</span>. Longer answer As the original/official syntax rules state (emphasis added): Markdown’s syntax is intended for one purpose: to be used as a format for writing for the web. Markdown is not a replacement for HTML, or even close … Read more
In standard Markdown, place an anchor <a name=”abcd”></a> where you want to link to and refer to it on the same page by [link text](#abcd). (This uses name= and not id=, for reasons explained in this answer.) Remote references can use [link text](http://…#abcd) of course. This works like a dream, provided you have control over … Read more
This seems to be followed by github/markup issue 991, where on ordered sub-list, decimal numerals automatically turns into roman numerals. I have found the cause of problem. It is CSS This is the expected way for nested ordered lists to render in HTML. This is not expected in HTML. https://jsfiddle.net/tf5jtv8s We don’t make any modifications … Read more
Github automatically parses anchor tags out of your headers. So you can do the following: [Custom foo description](#foo) # Foo In the above case, the Foo header has generated an anchor tag with the name foo Note: just one # for all heading sizes, no space between # and anchor name, anchor tag names must … Read more
Markdown is a plain-text file format. The extensions .md and .markdown are just text files written in Markdown syntax. If you have a Readme.md in your repo, GitHub will show the contents on the home page of your repo. Read the documentation: Standard Markdown GitHub Flavored Markdown You can edit the Readme.md file in GitHub … Read more
Update 30th, January 2013, 16 months later: GitHub Blog Post Relative links in markup files: Starting today, GitHub supports relative links in markup files. Now you can link directly between different documentation files, whether you view the documentation on GitHub itself, or locally, using a different markup renderer. You want examples of link definitions and … Read more
You could just use some HTML in your Markdown: <img src=”https://stackoverflow.com/questions/14675913/drawing.jpg” alt=”drawing” width=”200″/> Or via style attribute (not supported by GitHub) <img src=”https://stackoverflow.com/questions/14675913/drawing.jpg” alt=”drawing” style=”width:200px;”/> Or you could use a custom CSS file as described in this answer on Markdown and image alignment  CSS in another file: img[alt=drawing] { width: 200px; }
I believe that all the previously proposed solutions (apart from those that require specific implementations) result in the comments being included in the output HTML, even if they are not displayed. If you want a comment that is strictly for yourself (readers of the converted document should not be able to see it, even with … Read more