What does size attribute of number field type do?

[acalvino4]

When I go to create a number field type in the craft cp, there is a 'size' field. What does this do?

The docs say no more than "Size – The input’s size attribute."
Is this referring to the html size attribute? This would seem odd, bc it is not offered for any other field, bc the craft section settings already allow setting the input width (as shown below), and especially bc the mdn docs say that <input type=number> doesn't support the size attribute.

So what does this do?

[AugustMiller]

Sorry for any confusion. This may just be a legacy feature that has persisted, but I think it makes some sense… here's a few tidbits that may clarify what's going on:

Generalizations About Inputs

• Many inputs in the control panel are allowed to be the full width of their parent.
• Number inputs, however, don't often need very many characters—their values will probably share a general "magnitude" or number of significant places (either as large values, or values with a specific number of decimal places).

Input Type

The "Number" field is still rendered as an <input type="text"> element, in the Craft control panel:

<input
  type="text"
  id="fields-rating"
  class="text"
  name="fields[rating][value]"
  size="42"
  inputmode="numeric"
  autocomplete="off"
  dir="ltr">

☝️ Note the inputmode attribute, which is responsible for type="number"-esque UX improvements (like preventing inadvertent alphabetic input from causing validation issues).

Size Attribute

This is added—and does indeed work—because the generated HTML uses the text type.

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Hope this helps!