[horde] Horde 6 - Inline HTML error
Nels Lindquist
nlindq at maei.ca
Mon Apr 6 21:31:27 UTC 2026
Okay; got it working, but it was a bit of an effort.
I had:
horde/css_parser 2.0.0beta5 CSS parser library
horde/cssminify 2.0.0beta6 CSS minification library
Upgrading did nothing initially.
I tried installing sabberworm/php-css-parser, which gave me version
9.3.0, and the entire site stopped loading, with different errors:
PHP Fatal error: Class Sabberworm\CSS\Property\Declaration contains 1
abstract method and must therefore be declared abstract or implement the
remaining method (Sabberworm\CSS\Renderable::__toString) in
/var/www/html/horde6/vendor/sabberworm/php-css-parser/src/Property/Decla
ration.php on line 27
Stack trace:
#0 /var/www/html/horde6/vendor/composer/ClassLoader.php(576): include()
#1 /var/www/html/horde6/vendor/composer/ClassLoader.php(427):
{closure:Composer\Autoload\ClassLoader::initializeIncludeClosure():575}()
#2 [internal function]: Composer\Autoload\ClassLoader->loadClass()
#3
/var/www/html/horde6/vendor/thecodingmachine/safe/generated/8.1/classobj.php(17):
class_alias()
#4
/var/www/html/horde6/vendor/sabberworm/php-css-parser/src/Rule/Rule.php(16):
Safe\class_alias()
#5 /var/www/html/horde6/vendor/composer/autoload_real.php(45):
require('...')
#6 /var/www/html/horde6/vendor/composer/autoload_real.php(49):
{closure:ComposerAutoloaderInit40e1abd60ba24c0f96585851b5c9f552::getLoader():41}()
#7 /var/www/html/horde6/vendor/autoload.php(22):
ComposerAutoloaderInit40e1abd60ba24c0f96585851b5c9f552::getLoader()
#8 /var/www/html/horde6/web/horde/services/ajax.php(2): require_once('...')
#9 {main}
I tried force installing horde_cssparser:2.0.0beta6, but it explicitly
requires sabberworm/php-css-parser:8.9.0, which it didn't want to
install on PHP 8.5.
Adding the --ignore-platform-reqs flag for composer bypassed the PHP
version limitation and I ended up with the same versions you've got.
It seems to be running fine on PHP 8.5, and I'm no longer getting errors
when loading inline HTML.
--
Nels Lindquist
nlindq at maei.ca
On 2026-04-06 1:30 PM, Brent wrote:
> It appears you have an older css parser or something. Here's my
> configuration that is working with the same mime local file to enable
> html viewing.
>
> $ composer show|grep css
> horde/css_parser 2.0.0beta6 CSS parser library
> horde/cssminify 2.0.0beta6 CSS minification library
> sabberworm/php-css-parser 8.9.0 Parser for CSS Files written
> in PHP
>
> Enable the test.php script and see if it finds anything. Ralph and the
> team have put a lot more helpful debugging information into it and maybe
> it'll help isolate the issue.
>
> brent
>
> Quoting Nels Lindquist <nlindq at maei.ca>:
>
>> PHP 8.5 FPM.
>> Latest H6 updated this morning.
>>
>> I enabled inline HTML in IMP, by setting:
>>
>>> $mime_drivers['html']['inline'] = true;
>>
>> in var/config/imp/mime_drivers.local.php.
>>
>> After doing so, I'm now receiving an error when attempting to view
>> mail messages with HTML:
>>
>> [imp] Error: Call to undefined method
>> Horde\Css\Parser\Parser::keepOnlyDangerousCss() in
>> /var/www/html/horde6/vendor/horde/imp/lib/Mime/Viewer/Html.php:617
>>
>> Stack trace:
>> #0
>> /var/www/html/horde6/vendor/horde/imp/lib/Mime/Viewer/Html.php(558):
>> IMP_Mime_Viewer_Html->_parseCss()
>> #1
>> /var/www/html/horde6/vendor/horde/imp/lib/Mime/Viewer/Html.php(166):
>> IMP_Mime_Viewer_Html->_processDomDocument()
>> #2 /var/www/html/horde6/vendor/horde/imp/lib/Mime/Viewer/Html.php(76):
>> IMP_Mime_Viewer_Html->_IMPrender()
>> #3
>> /var/www/html/horde6/vendor/horde/mime_viewer/lib/Horde/Mime/Viewer/Base.php(157): IMP_Mime_Viewer_Html->_renderInline()
>> #4 /var/www/html/horde6/vendor/horde/imp/lib/Contents.php(665):
>> Horde_Mime_Viewer_Base->render()
>> #5
>> /var/www/html/horde6/vendor/horde/imp/lib/Mime/Viewer/Alternative.php(137): IMP_Contents->renderMIMEPart()
>> #6
>> /var/www/html/horde6/vendor/horde/imp/lib/Mime/Viewer/Alternative.php(55): IMP_Mime_Viewer_Alternative->_IMPrender()
>> #7
>> /var/www/html/horde6/vendor/horde/mime_viewer/lib/Horde/Mime/Viewer/Base.php(157): IMP_Mime_Viewer_Alternative->_renderInline()
>> #8 /var/www/html/horde6/vendor/horde/imp/lib/Contents.php(665):
>> Horde_Mime_Viewer_Base->render()
>> #9
>> /var/www/html/horde6/vendor/horde/imp/lib/Contents/Message.php(594):
>> IMP_Contents->renderMIMEPart()
>> #10
>> /var/www/html/horde6/vendor/horde/imp/lib/Contents/Message.php(336):
>> IMP_Contents_Message->_getInlineOutput()
>> #11
>> /var/www/html/horde6/vendor/horde/imp/lib/Contents/Message.php(176):
>> IMP_Contents_Message->getInlineOutput()
>> #12 /var/www/html/horde6/vendor/horde/imp/lib/Ajax/Queue.php(462):
>> IMP_Contents_Message->showMessage()
>> #13
>> /var/www/html/horde6/vendor/horde/imp/lib/Ajax/Application/Handler/Common.php(702): IMP_Ajax_Queue->message()
>> #14
>> /var/www/html/horde6/vendor/horde/core/lib/Horde/Core/Ajax/Application.php(179): IMP_Ajax_Application_Handler_Common->showMessage()
>> #15 /var/www/html/horde6/vendor/horde/horde/services/ajax.php(64):
>> Horde_Core_Ajax_Application->doAction()
>> #16 /var/www/html/horde6/web/horde/services/ajax.php(3):
>> require_once('...')
>> #17 {main} [pid 536324 on line 76 of
>> "/var/www/html/horde6/vendor/horde/core/lib/Horde/ErrorHandler.php"]
>>
>> --
>> Nels Lindquist
>> nlindq at maei.ca
>> --
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