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Yes; it just doesn't show up in the Jutoh editor. You can set the alignment to Justified in the properties for a named paragraph style, via the Project Properties dialog (click Edit on the toolbar). Then apply this style to one or more paragraphs.
Text won't appear justified within Jutoh but it will appear justified in ebooks where supported. Different readers support justification in different ways:
On Kindle devices and apps, there is no global setting in the reader for alignment; the book alignment is respected. Text with indeterminate alignment is shown justified, except within table cells, where it is shown left-aligned.
In Apple Books, the justification specification in the book is ignored, and justification or left alignment can be set for all books in the Apple Books settings. However, right aligned and centred content is supported (so long as Optimize for iBooks is enabled in your configuration to generate dummy spans that work around lack of centre alignment for some reader setting values).
On Adobe Digital Editions, there is no alignment setting, and alignment in the book is respected. Text with indeterminate alignment is shown left-aligned.
On Nook for PC, there is no alignment setting, and alignment in the book is respected. Text with indeterminate alignment is shown left-aligned.
On Nook for iOS, alignment in the book is respected if publisher defaults are on. Text with indeterminate alignment is shown left-aligned. With publisher defaults switched off, the justification option affects indeterminate alignment only.
On Nook for Android, alignment in the book is respected if the alignment setting in the app is set to Default. Text with indeterminate alignment is shown left-aligned. With the app alignment setting is justified or left-aligned, all paragraphs are affected.
On Kobo for PC and iOS, alignment in the book is respected and indeterminate alignment is shown left-aligned. If alignment is set, all paragraphs except headings use the alignment, including centred paragraphs.
On Kobo devices, alignment in the book is respected and indeterminate alignment is shown left-aligned. Alignment can be set to left-aligned or justified in the Kobo settings, which only affects paragraphs with indeterminate alignment.
On Tolino for Android, alignment in the book is respected and indeterminate alignment is shown left-aligned. If publisher defaults are overridden and alignment is set, all paragraphs use the alignment, including headings and centred paragraphs.
On Tolino for iOS, alignment in the book is not respected and all paragraphs use the current alignment setting, including headings and centred paragraphs.
On Bluefire Reader for PC, iOS and Android, alignment in the book is respected and indeterminate alignment is shown left-aligned. If advanced settings are enabled, alignment can be set to left-aligned or justified, which only affects paragraphs with indeterminate alignment.
On AZARDI, justification is either on or off - paragraphs with indeterminate, left, and justified alignment are all treated the same way (centred and right-justified text continue to work as expected). The exception to this is where Jutoh must supply 'text-align: initial' within a box whose containing paragraph is centred; this forces left-justification even if right-justification is set in AZARDI.
On Moon+ Reader for Android, setting justification in the app affects paragraphs with left alignment and indeterminate alignment. With justification switched off in the app, alignment is respected, with indeterminate alignment showing as left alignment.
So, should you justify your text, left-align it, or leave it indeterminate? Leaving it indeterminate does, in theory, allow for the greatest flexibility. The market-leading Kindle platform justifies indeterminately-aligned text, and justification does seem to be the most popular choice.
On non-Kindle platforms, the situation is bit more murky and varied, but if you feel that on balance your book should be justified, then explicitly set the alignment to justified, which will make for the fewest surprises, even if not all ereaders will then be able to adjust the alignment for those customers who prefer left alignment.
Note: From Jutoh 2.28 (released January 31st, 2015) up to Jutoh 2.53, Jutoh used the CSS property 'text-align:initial' for indeterminate justification. This wasn't enough to trigger defaults in some ereaders, so from Jutoh 2.54, the 'text-align' property is omitted for indeterminate alignment wherever possible, except where inherited alignment must be suppressed (for example indeterminately-aligned paragraphs within a box in a centred paragraph). In this case, 'justify' is used for Kindle (since this is the default alignment on Kindle) and 'left' for HTML and Epub.
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