Are CSS files generated from LESS files when they are accessed by the browser, or when the LESS file is modified/changed?

[LinearGradient]

Hi,

Are CSS files generated from LESS files when they are requested by the browser, or when the LESS file is modified/changed?

Thanks in advance.

[Sham_HC · Accepted solution]

All clientlibs are generated on request. For modification of less it might not rebuild you need to delete the generated file.  That is the case if you are in aem instance 5.6.1 or below. I believe it is fixed in aem6.