Less4j correctly translates all media queries conforming to css3 specification.

Test Case:

• W3CMediaTests

Links:

• W3c specification: https://www.w3.org/TR/css3-mediaqueries/
• W3c test cases: https://www.w3.org/Style/CSS/Test/MediaQueries/20120229/

Less4j correctly translates almost all selectors conforming to css3 specification. Namespaces are the only missing feature. Anything else is expected to work correctly.

Two types of w3c tests are skipped:

• those with namespaces,
• those that crashes less.js.

Test Case:

• W3CSelectorsTests

Links:

• W3c specification: https://www.w3.org/TR/css3-selectors/
• W3c test cases: https://www.w3.org/Style/CSS/Test/CSS3/Selectors/current/

Less4j translates CSS3 @keyframes Animations.

Test Case:

• Since w3c did not released test cases for this, the test case is part of basic StrictComplianceTest CSS compatibility test.

Links:

• W3c specification: https://www.w3.org/TR/css3-animations/
• W3c test cases: not available yet

Less4j translates CSS3 @document at-rule. W3c specification was still work in progress at the time of implementation, future changes are possible.

Test Case:

• Since w3c did not released test cases for this, the test case is part of basic StrictComplianceTest CSS compatibility test.

Links:

• W3c specification: https://www.w3.org/TR/2012/WD-css3-conditional-20120911/#at-document
• W3c test cases: not available yet
• Mozilla specification: https://developer.mozilla.org/en-US/docs/CSS/@document

Less4j translates CSS3 Paged Media.

Test Case:

• Since w3c did not released test suite and specification is not finished yet, we created test cases from examples in the CSS Paged Media Module Level 3 Editor's Draft 28 November 2012 version of the specification.

Links:

• W3c specification: https://dev.w3.org/csswg/css3-page/
• W3c test cases: not available yet

Less4j translates CSS3 Supports At-Rule.

Test Case:

• Since w3c did not released test suite and specification is not finished yet, we created test cases from examples in chapter 6. of the CSS Conditional Rules Module Level 3 Editor's Draft 21 February 2013 version of the specification.
• An additional tests set created from from Mozilla and Opera specifications is located in StrictComplianceTest test case.

Links:

• W3c specification: https://dev.w3.org/csswg/css3-conditional/#at-supports
• W3c test cases: not available yet
• Mozilla specification: https://developer.mozilla.org/en-US/docs/CSS/@supports
• Opera specification: https://dev.opera.com/articles/view/native-css-feature-detection-via-the-supports-rule/