kibana/style_guides/html_style_guide.md

HTML Style Guide

Multiple attribute values

When an element has multiple attributes, each attribute including the first should be on its own line with a single indent. This makes the attributes easier to scan and compare across similar elements.

The closing bracket should be on its own line. This allows attributes to be shuffled and edited without having to move the bracket around. It also makes it easier to scan vertically and match opening and closing brackets. This format is inspired by the positioning of the opening and closing parentheses in Pug/Jade.

<div
  attribute1="value1"
  attribute2="value2"
  attribute3="value3"
>
  Hello
</div>

If the element doesn't have children, add the closing tag on the same line as the opening tag's closing bracket.

<div
  attribute1="value1"
  attribute2="value2"
  attribute3="value3"
></div>