Did Chrome just generate a mysterious CSS code snippet on its own?

In my micro page, I have intentionally avoided using any external references, including a favicon.ico file. Instead, I have opted to use base64 inline images. The only CSS in use is inline within a <div> element. Interestingly, the following code does not originate from my source, so its origin and purpose are unknown.

Where does this code come from? What does it mean, and what impact does it have?

https://i.sstatic.net/eW6Rb.jpg

For easy copying and pasting:

<style type="text/css" style="display: none !important;">object:not([type]),object[classid$=":D27CDB6E-AE6D-11cf-96B8-444553540000"],object[classid$=":d27cdb6e-ae6-11cf-96b8-444553540000"],object[codebase*="swflash.cab"],object[data*=".swf"],embed[type="application/x-shockwave-flash"],embed[src*=".swf"],object[type="application/x-shockwave-flash"],object[src*=".swf"],object[codetype="application/x-shockwave-flash"],iframe[type="application/x-shockwave-flash"],object[classid$=":166B1BCA-3F9C-11CF-8075-444553540000"],object[codebase*="sw.cab"],object[data*=".dcr"],embed[type="application/x-director"],embed[src*=".dcr"],object[type="application/x-director"],object[src*=".dcr"],object[classid$=":15B782AF-55D8-11D1-B477-006097098764"],object[codebase*="awswaxf.cab"],object[data*=".aam"],embed[type="application/x-authorware-map"],embed[src*=".aam"],object[type="application/x-authorware-map"],object[src*=".aam"],object[classid*="32C73088-76AE-40F7-AC40-81F62CB2C1DA"],object[type="application/ag-plugin"],object[type="application/x-silverlight"],object[type="application/x-silverlight-2"],object[source*=".xaml"],object[sourceelement*="xaml"],embed[type="application/ag-plugin"],embed[source*=".xaml"]{display: none !important;}</style>

csshtmlgoogle-chromedom

Answer №1

Consider the following scenarios:

1) Potentially inserted by a browser plugin or extension.

Try switching to Incognito mode with all extensions disabled to see if the additional content disappears, indicating it may be caused by a plugin or extension.

2) Possibly added by the web server hosting the webpage

To determine if scenario #2 is the case, try opening the HTML file in your browser using a local file:// URL and observing if the extra content persists.

It is probable that this issue is linked to an Ad-Blocking browser plugin that has applied { display: none !important } CSS attribute to hide Flash, Shockwave, Silverlight, and similar content on the page.

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