It currently always uses PHP_EOL, which, of course, works, but you get slightly different results in Windows and Unix. User can now set line ending to `\n` or `\r\n` to ensure consistent results regardless of environment. Default remains PHP_EOL. We already do this for CSV.
Fix#3941. Html and Pdf Writers will show PrintArea if specified rather than the entire sheet. Html Writer, which needs to handle both screen and print views, will use PrintArea through CSS; PDF, which needs to handle only print view, will use it by not including rows and columns which are not in the PrintArea. The support is limited because:
- PrintArea can consist of several different ranges. The writers will use the PrintArea only if it consists of a single range.
- Html use will be effective only if `useInlineCSS` is set to `false`, which is its default value.
- Other aspects of page setup, e.g. horizontal centered, remain unsupported, with or without PrintArea.
Html Writer will also set a `data-printarea` attribute on the `table` declaration for a worksheet when appropriate. Html Reader will recognize and process that attribute. This usage does not require that the PrintArea consist of a single range.
oleibman