# Google chrome marks background images blue

**URL:** <https://talk.atomisystems.com/t/google-chrome-marks-background-images-blue/10639>\
**Category:** Support Questions\
**Created:** [October 27, 2026, 9:08pm UTC](https://talk.atomisystems.com/t/google-chrome-marks-background-images-blue/10639 "2026-10-27T21:08:18Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Rolf](https://talk.atomisystems.com/letter_avatar_proxy/v4/letter/r/94ad74/32.png) [@Rolf](https://talk.atomisystems.com/u/Rolf)\
**Post date:** [October 27, 2026, 9:08pm UTC](https://talk.atomisystems.com/t/google-chrome-marks-background-images-blue/10639/1 "2026-10-27T21:08:18Z")

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Problem: When the project does not fully fill the window in google chrome and I left-click on the side of the background image and then drag the clicked mouse pointer into the project, this marks the background image and some other objects blue. Can this be ‘switched off’ somewhere

Thanks, Rolf

ActivePresenter version: 10

OS: Win11

Notes:

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**Author:** ![Giang\_BTL](https://talk.atomisystems.com/user_avatar/talk.atomisystems.com/giang_btl/32/1677_2.png) [@Giang\_BTL](https://talk.atomisystems.com/u/Giang_BTL)\
**Post date:** [October 28, 2026, 2:50am UTC](https://talk.atomisystems.com/t/google-chrome-marks-background-images-blue/10639/2 "2026-10-28T02:50:19Z")

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Hi Rolf,

This is the browser’s text selection behavior. Text in the HTML5 output can be selected, so dragging the mouse across the content may highlight the text and some elements in blue.

If you want to prevent this, you can add the following JavaScript to the **On Load** event of the first slide:

```auto
document.addEventListener('selectstart', function(e) {
    e.preventDefault();
});

```

Please note that this will disable text selection for the entire page, so users will no longer be able to select and copy text by dragging the mouse.

Best regards,  
Giang

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**Author:** ![Rolf](https://talk.atomisystems.com/letter_avatar_proxy/v4/letter/r/94ad74/32.png) [@Rolf](https://talk.atomisystems.com/u/Rolf)\
**Post date:** [October 28, 2026, 3:59pm UTC](https://talk.atomisystems.com/t/google-chrome-marks-background-images-blue/10639/3 "2026-10-28T15:59:36Z")

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Thanks, Giang, that is exactly what i was looking for. Best, Rolf