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I need all images in org-mode displayed with 40%. Means I need the file itself displaying the pictures small, not the html export. This works flawless by putting above every image:

#+attr_html: :width 40%

Now to avoid repeating the upper line above each image I tried setting the attribute per subtree to no avail:

:PROPERTIES:
:EXPORT_OPTIONS: attr_html: :width 40%
:END:

How can I set this globally per org file or per subtree?

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  • I don't think this can be done in Org mode, but I'm pretty sure it can be done with CSS. Whenever you want to do something to every HTML element of a given type, CSS is the way to go.
    – NickD
    Feb 26, 2022 at 16:00
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    I did not get a notification when you changed your question. In the future, you might want to add a comment that you did so.
    – NickD
    Feb 26, 2022 at 19:23
  • 1
    @NickD Had already started writing a comment, yet stopped middle way. Thought there's no need to "outsmart" the algorithm. Gut feelings still prevail. Will gladly do as you suggested next time.
    – jjk
    Feb 26, 2022 at 21:55
  • Yup - we live and learn...
    – NickD
    Feb 26, 2022 at 22:17

1 Answer 1

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Following up on my comment, you can use CSS to do that per file (it is not possible however to limit the CSS to a subtree).

All you have to do is add this at the top of your file:

#+HTML_HEAD_EXTRA: <style> img { width: 40%; } </style>

EDIT: In answer to the modified question, set the variable org-image-actual-width to the width (an integer denoting the number of pixels) you want. To use a fraction of the text width, set it to a list whose car is that fraction:

 (setq org-image-actual-width '(0.4))

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