Template:Su/doc

Purpose
Template for creating two smaller lines of text on one actual line, this can be used for scientific notations of uncertainty and physics symbols, such as nuclides and particles.

It was named after the  and   HTML tags, which share the first two letters of their name with this template. This template uses the third letter of the name of these tags,  and , as the name of the argument that drives the output of the top and bottom line, respectively.

Editors beware: ''these templates use all kinds of hacky tricks to make the output render correctly in a wide variety of browsers. If you plan to make changes to this template, please make sure you verify that this template renders correctly after those changes in all major browsers. This list includes the latest version(s) of Chrome, Firefox, and Safari.''

Note on fractions
Usually, when using vulgar fractions it is MOS habit to use &amp;frasl; (MOS:FRAC) and frac. However, in &lt;sub> or &lt;sup> tags, best use the keyboard slash  for readability in most browsers:
 * X$1&frasl;2 7&frasl;8$ (fraction slash) ❌

and
 * X$1/2 7/8$ (keyboard slash) ✅

Simple

 * X$a$ X$b$ X$a b$ $a b$X $a b$X$c d$
 * X$a$ X$b$ X$a b$ $a b$X $a b$X$c d$

Left-aligned (default)

 * X$aaaaa b$ X$aaaaa b$Y X$a bbbbb$ $a bbbbb$X
 * X$aaaaa b$ X$aaaaa b$Y X$a bbbbb$ $a bbbbb$X

Right-aligned

 * X$aaaaa b$X$a bbbbb$X
 * X$aaaaa b$X$a bbbbb$X

Center-aligned

 * X$aaaaa b$X$a bbbbb$X
 * X$aaaaa b$X$a bbbbb$X

Smaller font

 * X$a$X$b$X$a b$X
 * X$a$X$b$X$a b$X

Larger font

 * X$a$X$b$X$a b$X
 * X$a$X$b$X$a b$X

Fixed-width

 * X$... www$X$... www$X
 * X$... www$X$... www$X

Line breaks
Unlike the  and   tags, this template does not always prevent line breaks between the two small lines and the text preceding or following it. Thus, if this template is used to supply a subscript and superscript over a base symbol, the whole structure has to be enclosed in a nowrap, or this template should be invoked through another template that takes care of the wrapping in an appropriate way.

Note: Without the suggested nowrap, this is not consistent across all browsers: in Chrome, this is true, whereas in Firefox and Safari line breaks will generally be suppressed after preceding text.

Example:  → X$4 4$