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This document describes version 6 of Unblu. If you’re using the latest major version of Unblu, go to the documentation of the latest version.

The support period for version 6 ended on 29 August 2023. We no longer provide support or updates for this version. You should upgrade to the latest version of Unblu.

CSS selectors level 3 limitations

This section indicates the current state of support of CSS Selectors Level 3 in Unblu co-browsing. Selectors listed in the "Supported" section are known to work properly in Unblu, whereas selectors listed in "Unsupported" have not been tested yet. Selectors not listed in any list are likely unsupported.

Selector list

Selector Example selector Support status

Substring matching attribute selectors

[att^=val] (prefix match)
[att$=val] (suffix match)
[att*=val] (substring match

Green_Tick

Root of the document

E:root

Green_Tick

nth child

E:nth-child(n)

Green_Tick

nth last child

E:nth-last-child(n)

Green_Tick

nth of type

E:nth-of-type(n)

Green_Tick

nth last of type

E:nth-last-of-type(n)

Green_Tick

first / last child of parent

E:first-child

E:last-child

Green_Tick

first / last of type

E:first-of-type

E:last-of-type

Green_Tick

only child

E:only-child

Green_Tick

only of type

E:only-of-type

Green_Tick

empty

E:empty

Green_Tick

checked user interface

E:checked

Green_Tick

"not" match selector

E:not(s)

Green_Tick

general sibling combinator

E ~ F

Green_Tick
Selector Example selector Support status

URI target

E:target

icon_forbidden (works syntactically but has not been tested in co-browsing sessions)

enabled / disabled user interface elements

E:enabled

E:disabled

icon_warning_1 (works syntactically but usually all user interface elements in Unblu are disabled — if styled differently, the agent has a different view from the visitor)