TYPO3 Core

@Natalia Postnikova

Sorry for this so late answer; I think you used a third-party extension to minify your HTML code. Could you tell us what extension did you use and the steps we should follow to reproduce your problem?

I tried with TYPO3 version 9.5.5 and the extension EXT:min version 1.7.0

1) create a form with only one field, type: "jQuery datepicker"
2) put the form on a page
3) install EXT:min
4) in TS Setup I wrote the same configuration of the extension's manual https://docs.typo3.org/typo3cms/extensions/min/#html-source-aka-tinysource:

plugin.tx_min.tinysource {
    enable = 1
    head {
        stripTabs = 1
        stripNewLines = 1
        stripDoubleSpaces = 1
        stripTwoLinesToOne = 1
        # Caution with this option! Indention sensitive code may break.
        stripSpacesBetweenTags = 0
    }
    body {
        stripComments = 1
        stripTabs = 1
        stripNewLines = 1
        stripDoubleSpaces = 1
        # Caution with this option! Indention sensitive code may break.
        stripSpacesBetweenTags = 0
        stripTwoLinesToOne = 0
        preventStripOfSearchComment = 1

        protectCode {
            10 = /(<textarea.*?>.*?<\/textarea>)/is
            20 = /(<pre.*?>.*?<\/pre>)/is
        }
    }
    oneLineMode = 1
}
</pre>

h3. Results

when viewing the page, the HTML source is minified, but AFAICS there is no error. Please could you add more detail? Thank you!

No feedback since the last 90 days => closing this issue.

If you think that this is the wrong decision or experience the issue again and have more information about how to reproduce your problem, please reopen it or ping me.

Thank you and best regards