\documentclass[10pt,a4paper]{article}

% Packages
\usepackage{fancyhdr}           % For header and footer
\usepackage{multicol}           % Allows multicols in tables
\usepackage{tabularx}           % Intelligent column widths
\usepackage{tabulary}           % Used in header and footer
\usepackage{hhline}             % Border under tables
\usepackage{graphicx}           % For images
\usepackage{xcolor}             % For hex colours
%\usepackage[utf8x]{inputenc}    % For unicode character support
\usepackage[T1]{fontenc}        % Without this we get weird character replacements
\usepackage{colortbl}           % For coloured tables
\usepackage{setspace}           % For line height
\usepackage{lastpage}           % Needed for total page number
\usepackage{seqsplit}           % Splits long words.
%\usepackage{opensans}          % Can't make this work so far. Shame. Would be lovely.
\usepackage[normalem]{ulem}     % For underlining links
% Most of the following are not required for the majority
% of cheat sheets but are needed for some symbol support.
\usepackage{amsmath}            % Symbols
\usepackage{MnSymbol}           % Symbols
\usepackage{wasysym}            % Symbols
%\usepackage[english,german,french,spanish,italian]{babel}              % Languages

% Document Info
\author{Daniel Lamb (daniellmb)}
\pdfinfo{
  /Title (shadow-dom-css-cheat-sheet.pdf)
  /Creator (Cheatography)
  /Author (Daniel Lamb (daniellmb))
  /Subject (Shadow DOM CSS Cheat Sheet)
}

% Lengths and widths
\addtolength{\textwidth}{6cm}
\addtolength{\textheight}{-1cm}
\addtolength{\hoffset}{-3cm}
\addtolength{\voffset}{-2cm}
\setlength{\tabcolsep}{0.2cm} % Space between columns
\setlength{\headsep}{-12pt} % Reduce space between header and content
\setlength{\headheight}{85pt} % If less, LaTeX automatically increases it
\renewcommand{\footrulewidth}{0pt} % Remove footer line
\renewcommand{\headrulewidth}{0pt} % Remove header line
\renewcommand{\seqinsert}{\ifmmode\allowbreak\else\-\fi} % Hyphens in seqsplit
% This two commands together give roughly
% the right line height in the tables
\renewcommand{\arraystretch}{1.3}
\onehalfspacing

% Commands
\newcommand{\SetRowColor}[1]{\noalign{\gdef\RowColorName{#1}}\rowcolor{\RowColorName}} % Shortcut for row colour
\newcommand{\mymulticolumn}[3]{\multicolumn{#1}{>{\columncolor{\RowColorName}}#2}{#3}} % For coloured multi-cols
\newcolumntype{x}[1]{>{\raggedright}p{#1}} % New column types for ragged-right paragraph columns
\newcommand{\tn}{\tabularnewline} % Required as custom column type in use

% Font and Colours
\definecolor{HeadBackground}{HTML}{333333}
\definecolor{FootBackground}{HTML}{666666}
\definecolor{TextColor}{HTML}{333333}
\definecolor{DarkBackground}{HTML}{444444}
\definecolor{LightBackground}{HTML}{F3F3F3}
\renewcommand{\familydefault}{\sfdefault}
\color{TextColor}

% Header and Footer
\pagestyle{fancy}
\fancyhead{} % Set header to blank
\fancyfoot{} % Set footer to blank
\fancyhead[L]{
\noindent
\begin{multicols}{3}
\begin{tabulary}{5.8cm}{C}
    \SetRowColor{DarkBackground}
    \vspace{-7pt}
    {\parbox{\dimexpr\textwidth-2\fboxsep\relax}{\noindent
        \hspace*{-6pt}\includegraphics[width=5.8cm]{/web/www.cheatography.com/public/images/cheatography_logo.pdf}}
    }
\end{tabulary}
\columnbreak
\begin{tabulary}{11cm}{L}
    \vspace{-2pt}\large{\bf{\textcolor{DarkBackground}{\textrm{Shadow DOM CSS Cheat Sheet}}}} \\
    \normalsize{by \textcolor{DarkBackground}{Daniel Lamb (daniellmb)} via \textcolor{DarkBackground}{\uline{cheatography.com/20888/cs/3759/}}}
\end{tabulary}
\end{multicols}}

\fancyfoot[L]{ \footnotesize
\noindent
\begin{multicols}{3}
\begin{tabulary}{5.8cm}{LL}
  \SetRowColor{FootBackground}
  \mymulticolumn{2}{p{5.377cm}}{\bf\textcolor{white}{Cheatographer}}  \\
  \vspace{-2pt}Daniel Lamb (daniellmb) \\
  \uline{cheatography.com/daniellmb} \\
        \uline{\seqsplit{www}.linkedin.com/in/daniellamb}
  \end{tabulary}
\vfill
\columnbreak
\begin{tabulary}{5.8cm}{L}
  \SetRowColor{FootBackground}
  \mymulticolumn{1}{p{5.377cm}}{\bf\textcolor{white}{Cheat Sheet}}  \\
   \vspace{-2pt}Not Yet Published.\\
   Updated 12th May, 2016.\\
   Page {\thepage} of \pageref{LastPage}.
\end{tabulary}
\vfill
\columnbreak
\begin{tabulary}{5.8cm}{L}
  \SetRowColor{FootBackground}
  \mymulticolumn{1}{p{5.377cm}}{\bf\textcolor{white}{Sponsor}}  \\
  \SetRowColor{white}
  \vspace{-5pt}
  %\includegraphics[width=48px,height=48px]{dave.jpeg}
  Measure your website readability!\\
  www.readability-score.com
\end{tabulary}
\end{multicols}}




\begin{document}
\raggedright
\raggedcolumns

% Set font size to small. Switch to any value
% from this page to resize cheat sheet text:
% www.emerson.emory.edu/services/latex/latex_169.html
\footnotesize % Small font.

\begin{multicols*}{2}

\begin{tabularx}{8.4cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{8.4cm}}{\bf\textcolor{white}{:host}}  \tn
\SetRowColor{white}
\mymulticolumn{1}{x{8.4cm}}{The \{\{link="http://dev.w3.org/csswg/css-scoping/\#selectordef-host"\}\}:host pseudo-class\{\{/link\}\} matches the shadow tree's host element. Given the following code, the selector :host matches the \textless{}x-foo\textgreater{} element. Compound selectors are also supported, such as :host(.foo) matches the \textless{}x-foo\textgreater{} element as well. \newline % Row Count 7 (+ 7)
\textless{}x-foo class="foo"\textgreater{} \newline % Row Count 8 (+ 1)
~~\textless{}"shadow tree"\textgreater{} \newline % Row Count 9 (+ 1)
~~~~\textless{}style\textgreater{} \newline % Row Count 10 (+ 1)
~~~~:host \{ /* matches x-foo */ \} \newline % Row Count 12 (+ 2)
~~~~\textless{}/style\textgreater{} \newline % Row Count 13 (+ 1)
~~~~\textless{}div class="foo"\textgreater{}...\textless{}/div\textgreater{} \newline % Row Count 15 (+ 2)
~~\textless{}/\textgreater{} \newline % Row Count 16 (+ 1)
\textless{}/x-foo\textgreater{}% Row Count 17 (+ 1)
} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{Note that using the .foo selector inside the shadow tree will only match the div.foo element and not the host x-foo.foo element.}  \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{8.4cm}}{\bf\textcolor{white}{::shadow}}  \tn
\SetRowColor{white}
\mymulticolumn{1}{x{8.4cm}}{The \{\{link="http://dev.w3.org/csswg/css-scoping/\#selectordef-shadow"\}\}::shadow pseudo-element\{\{/link\}\} matches the shadow tree's top-level elements. See the following code for examples. \newline % Row Count 4 (+ 4)
\textless{}style\textgreater{} \newline % Row Count 5 (+ 1)
x-foo::shadow \{ \newline % Row Count 6 (+ 1)
~~/* matches div and span\#root */  \newline % Row Count 7 (+ 1)
\} \newline % Row Count 8 (+ 1)
x-foo::shadow \textgreater{} span \{ \newline % Row Count 9 (+ 1)
~~/* matches only span\#root */  \newline % Row Count 10 (+ 1)
\} \newline % Row Count 11 (+ 1)
x-foo::shadow span \{ \newline % Row Count 12 (+ 1)
~~/* matches all spans */ \newline % Row Count 13 (+ 1)
\} \newline % Row Count 14 (+ 1)
\textless{}/style\textgreater{} \newline % Row Count 15 (+ 1)
\textless{}x-foo class="foo"\textgreater{} \newline % Row Count 16 (+ 1)
~~\textless{}"shadow tree"\textgreater{} \newline % Row Count 17 (+ 1)
~~~~\textless{}div\textgreater{} \newline % Row Count 18 (+ 1)
~~~~~~~~\textless{}span id="child"\textgreater{}...\textless{}/span\textgreater{} \newline % Row Count 20 (+ 2)
~~~~~~\textless{}/div\textgreater{} \newline % Row Count 21 (+ 1)
~~~~\textless{}span id="root"\textgreater{}...\textless{}/span\textgreater{} \newline % Row Count 23 (+ 2)
~~\textless{}/\textgreater{} \newline % Row Count 24 (+ 1)
\textless{}/x-foo\textgreater{}% Row Count 25 (+ 1)
} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{8.4cm}}{\bf\textcolor{white}{:host-context()}}  \tn
\SetRowColor{white}
\mymulticolumn{1}{x{8.4cm}}{The \{\{link="http://dev.w3.org/csswg/css-scoping/\#selectordef-host-context"\}\}:host-context() pseudo-class\{\{/link\}\} matches a parent element outside the shadow tree. Given the following code, the selector :host-context() matches the \textless{}div\textgreater{} element with the green-theme class. This can be used to cordinate styles for a group of web components, for exampe when theming. \newline % Row Count 8 (+ 8)
\textless{}div class="green-theme"\textgreater{} \newline % Row Count 9 (+ 1)
~~\textless{}x-foo\textgreater{} \newline % Row Count 10 (+ 1)
~~\textless{}"shadow tree"\textgreater{} \newline % Row Count 11 (+ 1)
~~~~\textless{}style\textgreater{} \newline % Row Count 12 (+ 1)
\seqsplit{~~~~:host-context(.green-theme)} \{ \newline % Row Count 14 (+ 2)
~~~~~~color: \#060; \newline % Row Count 15 (+ 1)
~~~~\} \newline % Row Count 16 (+ 1)
~~~~\textless{}/style\textgreater{} \newline % Row Count 17 (+ 1)
~~~~\textless{}div class="foo"\textgreater{}...\textless{}/div\textgreater{} \newline % Row Count 19 (+ 2)
~~\textless{}/\textgreater{} \newline % Row Count 20 (+ 1)
~~\textless{}/x-foo\textgreater{} \newline % Row Count 21 (+ 1)
\textless{}/div\textgreater{}% Row Count 22 (+ 1)
} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}


% That's all folks
\end{multicols*}

\end{document}