784648 - [CSS: text-indent] Implement 'each-line' and 'hanging'

Status: RESOLVED FIXED

(Core :: Layout: Text and Fonts, enhancement)

Description

[George]

User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.8; rv:14.0) Gecko/20100101 Firefox/14.0.1
Build ID: 20120713134347

Steps to reproduce:

Authors commonly want to add a text-indent on each paragraph of their writing.
(This is natural to anyone who composes documents in a page-based text editor)
To achieve this stylistic result, authors currently have to insert HTML code to delineate their paragraphs.

An author will, for example, write:

HTML
<article id=container>
<p>First paragraph ...</p>
<p>Second paragraph ...</p>
<p>Third paragraph ...</p>
</article>

CSS
p {text-indent: 2em;}

This unnecessarily pollutes the DOM with excess elements. Authors rarely plan to style each paragraph individually (beyond the current limitation of text-indent).

But, with text-indent: each-line implemented, an author could write the much simpler:

<article id=container>
First paragraph <br>
Second paragraph <br>
Third paragraph <br>
</article>

article {text-indent: 2em each-line}

Of course, if there is a practical reason to denote each paragraphs' start /end (JavaScript manipulation, linking through ids etc), the old way of adding markup would still be valid. But this is usually the exception, not the rule.

Interested readers can view the specification here:
http://www.w3.org/TR/css3-text/#text-indent0

Thank you for your time.

Comment 1

[Florian Bender]

There's also `text-indent: (value) hanging` and the combination of both. This bug should probably cover both as they are supplementary.

Comment 2

[Sebastian Zartner [:sebo]]

According to comment 3 the title of this issue should probably be changed to include 'hanging'.

Sebastian

Comment 3

[Sebastian Zartner [:sebo]]

> According to comment 3
Of course I meant comment 1.

Sebastian

Comment 4

[Thomas Wisniewski [:twisniewski]]

It seems the data on MDN and caniuse.com is outdated, as Safari apparently supports these as of version 16 (or perhaps 17, where the values do seem to be working for me in live testing). Chrome also has them behind an experimental flag, so it might be worth revisiting the priority here.

Comment 5

[Jonathan Kew [:jfkthame]]

According to https://github.com/mdn/browser-compat-data/issues/20363, they've been supported since Safari 15.

Comment 6

[Jonathan Kew [:jfkthame]]

Attachment: Bug 784648 - Implement the 'hanging' and 'each-line' options for CSS text-indent. r=#layout

Comment 7

[Jonathan Kew [:jfkthame]]

Attachment: Bug 784648 - Update WPT metadata for tests that now pass. r=#layout

Depends on D191522

Comment 8

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/5d24c715fa6f
Implement the 'hanging' and 'each-line' options for CSS text-indent. r=emilio
https://hg.mozilla.org/integration/autoland/rev/fd55b93190fe
Update WPT metadata for tests that now pass. r=dholbert

Comment 9

[Cosmin Sabou [:CosminS]]

https://hg.mozilla.org/mozilla-central/rev/5d24c715fa6f
https://hg.mozilla.org/mozilla-central/rev/fd55b93190fe

Comment 10

[(PTO June 19-July 7) Ryan VanderMeulen]

Did you want to nominate this for the Fx121 release notes?

Comment 11

[Jonathan Kew [:jfkthame]]

Release Note Request (optional, but appreciated)
[Why is this notable]: Simplifies the creation of hanging-indent layouts, which is a common author request.
[Affects Firefox for Android]: yes
[Suggested wording]: The CSS text-indent property now supports the 'hanging' and 'each-line' keywords, offering more convenient paragraph layout for styles such as bibliographies, poetry, etc.
[Links (documentation, blog post, etc)]: https://drafts.csswg.org/css-text/#text-indent-property

Comment 12

[(PTO June 19-July 7) Ryan VanderMeulen]

Added to the Fx121 relnotes.

Comment 13

[Zach Fox]

hi y'all :)

MDN issue: https://github.com/mdn/content/issues/30337

MDN PRs:

• https://github.com/mdn/browser-compat-data/pull/21309
• https://github.com/mdn/interactive-examples/pull/2668
• https://github.com/mdn/content/pull/30433