Bugfix: double quotes in table style attributes

[codeclown]

Example:

<style>
  td { background-image: url("test.png"); }
</style>
<td>Foobar</td>

Without this fix results in broken HTML:

<style>
  td { background-image: url("test.png"); }
</style>
<td style="background-image: url('test.png');" background="url(" test.png")"="">Foobar</td>

After fix:

<style>
  td { background-image: url("test.png"); }
</style>
<td style="background-image: url('test.png');" background="url('test.png')">Foobar</td>

[codeclown]

I have no idea why the Travis-test is failing in one environment.

  1)  juice-content/relative-url:
     Uncaught TypeError: Unknown encoding: 
      at stringSlice (buffer.js:557:9)
      at Buffer.toString (buffer.js:593:10)
      at Request.<anonymous> (node_modules/request/request.js:1145:39)
      at Gunzip.<anonymous> (node_modules/request/request.js:1091:12)
      at endReadableNT (_stream_readable.js:1047:12)
      at _combinedTickCallback (internal/process/next_tick.js:102:11)
      at process._tickCallback (internal/process/next_tick.js:161:9)
  2)  remote_url:
     Uncaught TypeError: Unknown encoding: 
      at stringSlice (buffer.js:557:9)
      at Buffer.toString (buffer.js:593:10)
      at Request.<anonymous> (node_modules/request/request.js:1145:39)
      at Gunzip.<anonymous> (node_modules/request/request.js:1091:12)
      at endReadableNT (_stream_readable.js:1047:12)
      at _combinedTickCallback (internal/process/next_tick.js:102:11)
      at process._tickCallback (internal/process/next_tick.js:161:9)

I am happy to help merge this PR if I get a hint from the maintainers as to what is the cause of error here.

[jrit]

The failure isn't related to your change, so that is fine. The change is clearly an improvement as it improves the syntax, though its a little weird that the background value is not what would be wanted for the background property on td, which should be a plain url, like background="test.png". Would you be interested in updating this to take the path out of the enclosing url('...') when the property is background? That would make this more valid.

[codeclown]

Yes, I can update this as you reflected (in a day or two). I wonder, though, if there are other cases like this where the attribute value should be different from the CSS property.

[codeclown]

@jrit Please see updated code.