jQuery 4 warning: Number-typed values are deprecated for jQuery.fn.css ("z-index", value) #1960
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jquery-migrate-3.3.2.js: 100 JQMIGRATE: Number-typed values are deprecated for jQuery.fn.css ("z-index", value) 
mgol reviewed Jul 6, 2021
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Thanks for the PR! I made all Migrate warnings disappear when tested against the latest jQuery & jQuery Migrate versions but I haven't checked with the development jQuery version which is when this warning appears.
That said, I think it's a bug in Migrate. The intention was to not warn against CSS properties on which auto-suffixing was already not happening. We'll need another check in Migrate for this, I think.
mgol changed the title 
| Migrated to jquery/jquery-migrate#438. |
mgol added a commit to jquery/jquery-migrate that referenced this pull request Jul 9, 2021
When used against jQuery Git (future jQuery 4), there were warnings when `.css()` was used against `z-index` with a number value. This didn't make sense as `z-index` never had `px` auto-appended. Commit d25ecd6 was supposed to solve a similar problem but it only worked fine for `3.x`. To make the warning not show up when used with jQuery >=4 we need to fill in `jQuery.cssNumber` with the latest version from jQuery 3.x so that the same properties are allowed to have number values used with `.css()`. Fixes gh-438 Closes gh-439 Ref jquery/jquery-ui#1960
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jquery-migrate-3.3.2.js: 100 JQMIGRATE: Number-typed values are deprecated for jQuery.fn.css ("z-index", value)