No text
$$
the quick brown fox jumped over the lazy dog. \\\\
THE QUICK BROWN FOX JUMPED OVER THE LAZY DOG!
$$
Plain text
`\text{ }`
$$
\text{the quick brown fox jumped over the brown dog.} \\\\
\text{THE QUICK BROWN FOX JUMPED OVER THE LAZY DOG!}
$$
Text Boldface
`\textbf{ }`
$$
\textbf{the quick brown fox jumped over the lazy dog.} \\\\
\textbf{THE QUICK BROWN FOX JUMPED OVER THE LAZY DOG!}
$$
Text Italic
`\textit{ }`
$$
\textit{the quick brown fox jumped over the lazy dog.} \\\\
\textit{THE QUICK BROWN FOX JUMPED OVER THE LAZY DOG!}
$$
Text Roman
`\textrm{ }`
$$
\textrm{the quick brown fox jumped over the lazy dog.} \\\\
\textrm{THE QUICK BROWN FOX JUMPED OVER THE LAZY DOG!}
$$
Text Typewritter
`\texttt{ }`
$$
\texttt{the quick brown fox jumped over the lazy dog.} \\\\
\texttt{THE QUICK BROWN FOX JUMPED OVER THE LAZY DOG!}
$$