Order mail confirmation generates DOMXPath::query() error

Question

on order place the email contains the following error and does not display properly

CSS Inline Error: Warning: DOMXPath::query(): Invalid expression in .../vendor/pelago/emogrifier/Classes/Emogrifier.php on line 269 

How do I fix this?

Answer 1

This may be a bug of Emogrifier module.

Put this in the require-dev part of composer.json:

"pelago/emogrifier": "1.0.0 as 0.1.1"

Or prefer the development version:

"pelago/emogrifier": "dev-master as 0.1.1"

There is a notice: seem that this issue also occurs when processing static content deploy.

UPDATE:

We should take a look:

vendor/magento/theme-frontend-blank/web/css/email.less

@import 'source/lib/_lib.less'; // Global lib
@import 'source/lib/variables/_email.less'; // Global email variables
@import 'source/_theme.less'; // Global variables override
@import 'source/_variables.less'; // Local theme variables
@import 'source/_email-variables.less'; // Theme variables for emails

Magento email will import some less files. So, if we added some unsupported selectors to these files, that may cause this issue.

vendor/magento/theme-frontend-blank/web/css/source/_email-base.less

Unsupported selectors (examples in parenthesis):
      * first-child (div:first-child)
      * last-child (div:last-child)
      * nth-child (div:nth-child(3n+1))
      * universal (*)
      * pseudo (a:hover, a:active, a:focus, span:before, span:after, etc)

For example, in our custom theme, we add some unsupported selectors:

app/design/frontend/VendorTheme/default/web/css/source/_theme.less

...
#customer-service-menu li.item:nth-child(2) {position: absolute;}
...

This issue will occurs again.

SOLUTION:

We should create a new folder which contains the stand less files for our email styles. And, these files are only for email.

app/design/frontend/VendorTheme/default/web/css/email.less

@import 'source/lib/email/stand/_lib.less'; // Global lib
@import 'source/lib/email/stand/variables/_email.less'; // Global email variables

Answer 2

Using Magento 2.2.2 and experiencing the same error and fixed it this way:

"pelago/emogrifier": "2.0.0 as 1.2.0" as requirement in composer.json
composer update pelago/emogifier && magento setup:upgrade

Answer 3

Now i got solution
/var/www/html/vendor/pelago/emogrifier/Classes/Emogrifier.php
Line 595, find and replace below function

private function splitCssAndMediaQuery($css)
    {
        $media = '';

        $css = preg_replace_callback(
            '#@media\\s+(?:only\\s)?(?:[\\s{\\(]|screen|all)\\s?[^{]+{.*}\\s*}\\s*#misU',
            function ($matches) use (&$media) {
                $media .= $matches[0];
            },
            $css
        );

        // filter the CSS
        $search = array(
            // get rid of css comment code
            '/\\/\\*.*\\*\\//sU',
            // strip out any import directives
            '/^\\s*@import\\s[^;]+;/misU',
            // strip remains media enclosures
            '/^\\s*@media\\s[^{]+{(.*)}\\s*}\\s/misU',          
        );

        $replace = array(
            '',
            '',
            '',         
        );

replace

private function splitCssAndMediaQuery($css)
    {
        $media = '';

        $css = preg_replace_callback(
            '#@media\\s+(?:only\\s)?(?:[\\s{\\(]|screen|all)\\s?[^{]+{.*}\\s*}\\s*#misU',
            function ($matches) use (&$media) {
                $media .= $matches[0];
            },
            $css
        );

        // filter the CSS
        $search = array(
            // get rid of css comment code
            '/\\/\\*.*\\*\\//sU',
            // strip out any import directives
            '/^\\s*@import\\s[^;]+;/misU',
            // strip remains media enclosures
            '/^\\s*@media\\s[^{]+{(.*)}\\s*}\\s/misU',
            '/^\\s*@-?[A-Za-z-]+\\s[^{]+{(.*)}\\s*}\\s/misU',
        );

        $replace = array(
            '',
            '',
            '',
            '',
        );

Answer 4

I just recently came from similar problem. I hope these changes may help you.

found a solution for Magento 2

created the files

/web/css/email.less

and

/web/css/email-inline.less

in my custom theme and added the content from

/vendor/magento/theme-frontend-blank/web/css/email.less

and

/vendor/magento/theme-frontend-blank/web/css/email-inline.css respectively

Please Note below

but each with the line "@import 'source/_theme.less';" commented out (or removed)