LGTM1
On 8/21/23 1:52 PM, Yi Xu wrote:
Hi Yoav,
In first attempt link
<https://groups.google.com/a/chromium.org/forum/#!searchin/blink-dev/intent$20to$20ship$20textmetrics%7Csort:date/blink-dev/KQW4thKogkk/SiE-xZ7OAQAJ>,
we tried to ship all the attributes under TextMetrics API (in 2018).
Some definitions were not clear so we was not able to do it.
In second attempt
<https://groups.google.com/a/chromium.org/g/blink-dev/c/dTL2nW5mhGc>,
we shipped
actualBoundingBoxLeft, actualBoundingBoxRight, fontBoundingBoxAscent,
fontBoundingBoxDescent, actualBoundingBoxAscent,
actualBoundingBoxDescent, emHeightAscent and emHeightDescent.
In third attempt
<https://groups.google.com/a/chromium.org/g/blink-dev/c/GSmWjdqmgCA/m/F8YRklTQCQAJ>,
we shipped fontBoundingBoxAscent, fontBoundingBoxDescent
In this attempt, we are trying to ship alphabeticBaseline,
hangingBaseline and ideographicBaseline. Note that both Safari and
firefox have shipped it, so we will like to catch up on this.
Thank you,
Yi Xu
On Sun, Aug 20, 2023 at 10:40 PM Yoav Weiss <yoavwe...@chromium.org>
wrote:
On Fri, Aug 18, 2023 at 8:25 PM Yi Xu <yi...@chromium.org> wrote:
Contact emails
yi...@chromium.org, aaro...@chromium.org, fs...@chromium.org
Explainer
https://learn.microsoft.com/en-us/typography/opentype/spec/baselinetags
Specification
https://html.spec.whatwg.org/multipage/canvas.html#textmetrics
we are launching the following attributes in TextMetrics:
alphabeticBaseline, hangingBaseline and ideographicBaseline
*Tag Review*
https://github.com/w3ctag/design-reviews/issues/302
Summary
This is the 4th installment in extending the TextMetrics API
(first attempt link
<https://groups.google.com/a/chromium.org/forum/#!searchin/blink-dev/intent$20to$20ship$20textmetrics%7Csort:date/blink-dev/KQW4thKogkk/SiE-xZ7OAQAJ>,
second
attempt
<https://groups.google.com/a/chromium.org/g/blink-dev/c/dTL2nW5mhGc>,
third attempt)
<https://groups.google.com/a/chromium.org/g/blink-dev/c/GSmWjdqmgCA/m/F8YRklTQCQAJ>.The
current canvas TextMetrics API exposes the actualBoundingBox
and the fontBoundingBox readings. The definition of baseline
is more clear now. Both Firefox and Safari have already
shipped this *extension to TextMetrics*.
Thanks for pushing through this!! Any details on why the past
attempts weren't successful?
The original feature bug (https://crbug.com/277215
<https://crbug.com/277215>) has strong user support (23 stars).
Blink component
Blink>Canvas
<https://bugs.chromium.org/p/chromium/issues/list?q=component%3ABlink%3ECanvas&can=2>
Is this feature supported on all six Blink platforms (Windows,
Mac, Linux, Chrome OS, Android, and Android WebView)?
Yes
Is this feature fully tested byweb-platform-tests
<https://chromium.googlesource.com/chromium/src/+/master/docs/testing/web_platform_tests.md>?
Link to test suite results fromwpt.fyi
<https://wpt.fyi/results/?label=experimental>.
https://wpt.fyi/results/html/canvas/element/text/2d.text.measure.baselines.html?label=experimental&label=master&aligned
<https://wpt.fyi/results/html/canvas/element/text/2d.text.measure.baselines.html?label=experimental&label=master&aligned>
Entry on thefeature dashboard <http://www.chromestatus.com/>
https://chromestatus.com/feature/6516079022571520
<https://chromestatus.com/feature/6516079022571520>
Risks
Interoperability and Compatibility
Safari and Firefox have has already shipped these metrics in
the spec.
Firefox:<https://bugzilla.mozilla.org/show_bug.cgi?id=1102584>Shipped
<https://bugzilla.mozilla.org/show_bug.cgi?id=1102584>
Safari:Shipped <https://bugs.webkit.org/show_bug.cgi?id=157629>
We know this is a feature requested by developers (as well as
internal Google teams like Google Docs). This API will help
developers have more control and more accurate text rendering.
As of today a different way to achieve this is by using
rendering text to the DOM and using getBoundingClientRect to
get some measurements. This process requires a relayout of the
page.
Activation
Enable the platform experiment ExtendedTextMetrics
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