Report where styles come from

[bartveneman]

Sometimes it's pretty interesting to know where styles may have come from. Some possible options:

• <link rel="stylesheet"> in HTML
• <link rel="stylesheet"> generated by JS
• <style> in HTML
• <style> generated by JS
• <div style=""> in HTML
• <div style=""> generated by JS
• element.style.color = 'red' in JS
• myStyle.insertRule('#blanc { color: white }', 0); CSSStyleSheet.insertRule()
• @import rules for most of the above mentioned cases

Prior art

• get-css does this, but not for JS-generated CSS, I think

[bartveneman]

Fixed in 0e93480