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To render items in three columns, I attempted to add the following CSS3 directives to my project's README.md file, but the styling was stripped out:
<div style="-webkit-column-count: 3; -moz-column-count: 3; column-count: 3; -webkit-column-rule: 1px dotted #e0e0e0; -moz-column-rule: 1px dotted #e0e0e0; column-rule: 1px dotted #e0e0e0;">
<div style="display: inline-block;">
<!-- first column's content -->
</div>
<div style="display: inline-block;">
<!-- second column's content -->
</div>
<div style="display: inline-block;">
<!-- third column's content -->
</div>
</div>
This styling works correctly outside of GitHub's processing of Markdown. How can I put data into multiple columns in a Markdown document? Note that I am not concerned about support for IE browsers and don't care if IE renders a single column (my software project does not work on Windows clients, anyway).
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To add a table, use three or more hyphens ( --- ) to create each column's header, and use pipes ( | ) to separate each column. For compatibility, you should also add a pipe on either end of the row. Cell widths can vary, as shown below. The rendered output will look the same.
You can create tables with pipes | and hyphens - . Hyphens are used to create each column's header, while pipes separate each column. You must include a blank line before your table in order for it to correctly render. The pipes on either end of the table are optional.
GitHub-Flavored Markdown only permits certain allow-listed tags and attributes in inline HTML:
HTML
You can use a subset of HTML within your READMEs, issues, and pull requests.
A full list of our supported tags and attributes can be found in the README for github/markup.
Regarding <div> tags, that README says that only the itemscope and itemtype attributes are allow-listed, in addition to the general attribute allowlist:
abbr,accept,accept-charset,accesskey,action,align,alt,axis,border,cellpadding,cellspacing,char,charoff,charset,checked,cite,clear,cols,colspan,color,compact,coords,datetime,dir,disabled,enctype,for,frame,headers,height,hreflang,hspace,ismap,label,lang,longdesc,maxlength,media,method,multiple,name,nohref,noshade,nowrap,prompt,readonly,rel,rev,rows,rowspan,rules,scope,selected,shape,size,span,start,summary,tabindex,target,title,type,usemap,valign,value,vspace,width,itemprop
No tags support the style attribute.
Unless you can hack something together with the tags and attributes listed in that README I think you'll find that you're out of luck.
An alternative would be to put together a GitHub Pages site, which seems to be much more flexible.
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