Formatting of posts can be done using the visual editor within Stack Exchange, Markdown and some HTML. The latter includes "the following safe, whitelisted subset of HTML tags":
<a> - hyperlink.
<b> - bold, use as last resort <h1>-<h3>, <em>, and <strong> are
preferred.
<blockquote> - specifies a section that is quoted from another source.
<code> - defines a piece of computer code.
<del> - delete, used to indicate modifications.
<dd> - describes the item in a <dl> description list.
<dl> - description list.
<dt> - title of an item in a <dl> description list.
<em> - emphasized.
<h1>, <h2>, <h3> - headings.
<i> - italic.
<img> - specifies an image tag.
<kbd> - represents user input (usually keyboard input).
<li> - list item in an ordered list <ol> or an unordered list <ul>.
<ol> - ordered list.
<p> - paragraph.
<pre> - pre-element displayed in a fixed width font and and
unchanged line breaks.
<s> - strikethrough.
<sup> - superscript text appears 1/2 character above the baseline
used for footnotes and other formatting.
<sub> - subscript appears 1/2 character below the baseline.
<strong> - defines important text.
<strike> - strikethrough is deprecated, use <del> instead.
<ul> - unordered list.
<br> - line break.
<hr> - defines a thematic change in the content, usually via a
horizontal line.
You can strikeout a piece of text using the <s>
...</s>
HTML tag pairs.
For more information, see How do I format my posts using Markdown or HTML?
<s>strike through</s>
. – siracusa May 8 '19 at 19:02<s>your text</s>
but your question is for Meta. – CarLaTeX May 8 '19 at 19:02