margin.md

## margin


<!-- CSSJSON.margin.description -->

<!-- CSSJSON.margin.syntax -->

<!-- CSSJSON.margin.values -->

<!-- CSSJSON.margin.defaultValue -->

<!-- CSSJSON.margin.unixTags -->

**注意**  
app端不支持外边距折叠
3.98以下版本当position:fixed|absolute时,margin不支持auto

<!-- CSSJSON.margin.compatibility -->

<!-- CSSJSON.margin.reference -->