Title: Critical CSS issue, syntax error unknown word
Last modified: June 19, 2020

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# Critical CSS issue, syntax error unknown word

 *  Resolved [spread777](https://wordpress.org/support/users/spread777/)
 * (@spread777)
 * [5 years, 11 months ago](https://wordpress.org/support/topic/critical-css-issue-syntax-error-unknown-word/)
 * Hi,
    I’m trying to use CCSS from litespeed, but all the ccss file in QUIC.cloud
   I saw the same syntax error, <style id=”litespeed-optm-css-rules”>/*CssSyntaxError:/
   wp-content/plugins/tourmaster/tourmaster.css:1:91734: Unknown word*/</style>
 * I try to locate the error and asked to author of the plugin, both of us can not
   find it, pls help.
 * The page I need help with: _[[log in](https://login.wordpress.org/?redirect_to=https%3A%2F%2Fwordpress.org%2Fsupport%2Ftopic%2Fcritical-css-issue-syntax-error-unknown-word%2F%3Foutput_format%3Dmd&locale=en_US)
   to see the link]_

Viewing 3 replies - 1 through 3 (of 3 total)

 *  [AppsON Hosting](https://wordpress.org/support/users/appson/)
 * (@appson)
 * [5 years, 11 months ago](https://wordpress.org/support/topic/critical-css-issue-syntax-error-unknown-word/#post-13011463)
 * There are many errors with that file. You can test CSS with a linter, an online
   tool can be found here [http://csslint.net/](http://csslint.net/).
 * Ask the plugin author to use a linter on their CSS. It would pick up the issues
   instantly.
 * I recommend [https://stylelint.io/](https://stylelint.io/) but they can also 
   use [https://github.com/CSSLint/csslint](https://github.com/CSSLint/csslint).
 * Tell them to incorporate it into their build process before releasing updates
   to prevent issues in future.
 * **Here are the 3 critical errors.**
 * line: 1198, column: 105
    Parsing Errors Expected RBRACE at line 1198, col 105.
 * `.tourmaster-tour-category-grid.tourmaster-with-thumbnail .tourmaster-tour-category-
   overlay{ opacity: 0; alpha(opacity=0);`
 * line: 1226, column: 107
 * Parsing Errors Expected RBRACE at line 1226, col 107.
 * `.tourmaster-tour-category-grid-2.tourmaster-with-thumbnail .tourmaster-tour-
   category-overlay{ opacity: 0; alpha(opacity=0);`
 * line: 1253, column: 107
    Parsing Errors Expected RBRACE at line 1253, col 107.
 * `.tourmaster-tour-category-grid-3.tourmaster-with-thumbnail .tourmaster-tour-
   category-overlay{ opacity: 0; alpha(opacity=0);`
 * The issue is that `alpha(opacity=0);` is not valid CSS, it should be `filter:
   alpha(opacity=0);`.
 *  Thread Starter [spread777](https://wordpress.org/support/users/spread777/)
 * (@spread777)
 * [5 years, 10 months ago](https://wordpress.org/support/topic/critical-css-issue-syntax-error-unknown-word/#post-13059247)
 * Hi, this means I should correct all the errors so that the critical css could
   work?
 *  Plugin Support [Hai Zheng⚡](https://wordpress.org/support/users/hailite/)
 * (@hailite)
 * [5 years, 10 months ago](https://wordpress.org/support/topic/critical-css-issue-syntax-error-unknown-word/#post-13060284)
 * Yes

Viewing 3 replies - 1 through 3 (of 3 total)

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 * 3 replies
 * 3 participants
 * Last reply from: [Hai Zheng⚡](https://wordpress.org/support/users/hailite/)
 * Last activity: [5 years, 10 months ago](https://wordpress.org/support/topic/critical-css-issue-syntax-error-unknown-word/#post-13060284)
 * Status: resolved