I'm on the warpath (again) about improperly encoded Smart Quotes which appear as mystery boxes on my Mac/Safari. See example below.

Web Site with Improperly Encoded Quotes as Seen on Safari
For the record, the HTML Entity Codes are as follows.| “ | “ (left curly quote) |
|---|---|
| ‘ | ‘ (left single curly quote) |
| ” | ” (right curly quote) |
| ’ | ’ (right single curly quote) |
| – | – (en dash) |
| — | — (em dash) |
And for those of you who may encounter non-English text, these quote marks are also in use.
| « | « (left angle) |
|---|---|
| » | » (right angle) |
| ‹ | ‹ (left single angle) |
| › | › (right single angle) |
| „ | „ (bottom quote) |
| ‚ | ‚ (single bottom quote) |