javascript - Advanced styling of browser console.log - Stack Overflow

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The output of console.log can be styled and the basics are covered at the StackOverflow question Colors in JavaScript console.

Basic Styling

console.log('%c Oh my heavens! ', 'background: #222; color: #bada55');

Advanced Styling

What about advanced styles? How far can console.log be styled?

How about images? Using background-image doesn't seem to work.

How about display: block? It seems that setting display: block has no effect.

How about custom fonts? font-family seems to work but how to use custom fonts?

For my use case, I only need Chrome support.

Edit

I managed to implement images. The trick is to use a padding to set the size of the image. For example:

var style = [
  'background-image: url(".gif")',
  'background-size: contain',
  'background-repeat: no-repeat',
  'color: #000',
  'padding: 20px 20px',
  'line-height: 0px'
  ].join(';');
console.log('%c ', style);

Edit 2

Firefox blocks external images in console styles, but supports dataURIs: . Also, Firefox let's you simply display: block entries, see the list of properties supported by Firefox.

The output of console.log can be styled and the basics are covered at the StackOverflow question Colors in JavaScript console.

Basic Styling

console.log('%c Oh my heavens! ', 'background: #222; color: #bada55');

Advanced Styling

What about advanced styles? How far can console.log be styled?

How about images? Using background-image doesn't seem to work.

How about display: block? It seems that setting display: block has no effect.

How about custom fonts? font-family seems to work but how to use custom fonts?

For my use case, I only need Chrome support.

Edit

I managed to implement images. The trick is to use a padding to set the size of the image. For example:

var style = [
  'background-image: url("https://media.giphy./media/3o85xoi6nNqJQJ95Qc/giphy.gif")',
  'background-size: contain',
  'background-repeat: no-repeat',
  'color: #000',
  'padding: 20px 20px',
  'line-height: 0px'
  ].join(';');
console.log('%c ', style);

Edit 2

Firefox blocks external images in console styles, but supports dataURIs: https://bugzil.la/1134512. Also, Firefox let's you simply display: block entries, see the list of properties supported by Firefox.

• javascript
• css
• google-chrome-devtools
• console.log
• devtools

Share Improve this question Follow edited Jul 10, 2020 at 11:58 brillout asked Jul 8, 2020 at 11:05 brilloutbrillout 7,4741515 gold badges7979 silver badges9595 bronze badges 8

• developers.google./web/tools/chrome-devtools/console/… – Arthur Rubens Commented Jul 8, 2020 at 11:27
• @ArthurRubens I know about this but it is, unfortunately, nowhere close to a full spec. – brillout Commented Jul 8, 2020 at 11:41
• 2 You can inspect the source code of devtools frontend, it's in JS. – woxxom Commented Jul 8, 2020 at 11:43
• 1 You can do both. For the second thing see How do you inspect the web inspector in Chrome? – woxxom Commented Jul 8, 2020 at 11:49
• 1 Note (to self): Firefox blocks external images in console styles, but supports dataURIs. bugzil.la/1134512 (Also, Firefox let's you simple display:block entries.) – myf Commented Jul 10, 2020 at 11:51

 |  Show 3 more ments

1 Answer 1

Sorted by: Reset to default 13 +50

Chrome / Chromium seems to allow CSS properties beginning with any of the following prefixes:

• background
• border
• color
• font
• line
• margin
• padding
• text
• -webkit-background
• -webkit-border
• -webkit-font
• -webkit-margin
• -webkit-padding
• -webkit-text

For pleteness' sake, @myf has already linked to the properties supported by Firefox. They are:

• background and its longhand equivalents.
• border-radius
• border and its longhand equivalents
• box-decoration-break
• box-shadow
• clear and float
• color
• cursor
• display
• font and its longhand equivalents
• line-height
• margin
• outline and its longhand equivalents
• padding
• text-* properties such as text-transform
• white-space
• word-spacing and word-break
• writing-mode

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