Re: [html-tests] Add a couple of tests that img delays the load event (#5509)

# [Codecov](https://codecov.io/gh/w3c/web-platform-tests/pull/5509?src=pr&el=h1) Report
> Merging [#5509](https://codecov.io/gh/w3c/web-platform-tests/pull/5509?src=pr&el=desc) into [master](https://codecov.io/gh/w3c/web-platform-tests/commit/1d677e397df5e57bfc127a17b8828e3ba5062cc7?src=pr&el=desc) will **not change** coverage.
> The diff coverage is `n/a`.

[![Impacted file tree graph](https://codecov.io/gh/w3c/web-platform-tests/pull/5509/graphs/tree.svg?width=650&src=pr&token=DI3aecdnSC&height=150)](https://codecov.io/gh/w3c/web-platform-tests/pull/5509?src=pr&el=tree)

```diff
@@           Coverage Diff           @@
##           master    #5509   +/-   ##
=======================================
  Coverage   87.22%   87.22%           
=======================================
  Files          24       24           
  Lines        2418     2418           
  Branches      406      406           
=======================================
  Hits         2109     2109           
  Misses        239      239           
  Partials       70       70
```



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[Continue to review full report at Codecov](https://codecov.io/gh/w3c/web-platform-tests/pull/5509?src=pr&el=continue).
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> Powered by [Codecov](https://codecov.io/gh/w3c/web-platform-tests/pull/5509?src=pr&el=footer). Last update [1d677e3...9754b51](https://codecov.io/gh/w3c/web-platform-tests/pull/5509?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).


View on GitHub: https://github.com/w3c/web-platform-tests/pull/5509#issuecomment-295775677

Received on Thursday, 20 April 2017 15:19:31 UTC