Re: [blink-dev] Intent to Ship: Baselines in New TextMetrics API in Canvas

2023-08-22 Thread Yi Xu 
Hi Ashley,

Thank you for reviewing! I am trying to launch hanging, alphabetic and
ideographic baselines and the issues that you pointed out are related to
the "top" baseline. I can look into the top baseline definition afterwards.

Yi Xu

On Tue, Aug 22, 2023 at 5:59 AM Ashley Gullen  wrote:

> There is still this open issue about inconsistent TextMetrics measurements
> across browsers:
> https://bugs.chromium.org/p/chromium/issues/detail?id=1183752
> I think it may involve this unresolved spec issue:
> https://github.com/whatwg/html/issues/6731
>
> This is causing us constant annoying compatibility problems across
> browsers - we just can't draw or align text in a canvas consistently across
> browsers and our customers keep complaining about it. Shouldn't these
> issues be sorted out before adding even more text metrics?
>
> On Tue, 22 Aug 2023 at 00:14, 'TAMURA, Kent' via blink-dev <
> blink-dev@chromium.org> wrote:
>
>> LGTM3.
>>
>>
>> On Tue, Aug 22, 2023 at 5:11 AM Chris Harrelson 
>> wrote:
>>
>>> LGTM2
>>>
>>> On Mon, Aug 21, 2023 at 1:01 PM Mike Taylor 
>>> wrote:
>>>
 LGTM1
 On 8/21/23 1:52 PM, Yi Xu wrote:

 Hi Yoav,

 In first attempt link
 ,
 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
 ,
 we shipped actualBoundingBoxLeft, actualBoundingBoxRight, 
 fontBoundingBoxAscent,
 fontBoundingBoxDescent, actualBoundingBoxAscent, actualBoundingBoxDescent,
 emHeightAscent and emHeightDescent.
 In third attempt
 ,
 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 
 wrote:

>
>
> On Fri, Aug 18, 2023 at 8:25 PM Yi Xu  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
>> 
>> , second attempt
>> 
>> , third attempt)
>> 
>> .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) has strong user
>> support (23 stars).
>>
>> Blink component Blink>Canvas
>> 
>>
>> Is this feature supported on all six Blink platforms (Windows, Mac,
>> Linux, Chrome OS, Android, and Android WebView)?
>>
>> Yes
>>
>>
>> Is this feature fully tested by web-platform-tests
>> ?
>> Link to test suite results from wpt.fyi
>> .
>>
>>
>> https://wpt.fyi/results/html/canvas/element/text/2d.text.measure.baselines.html?label=experimental=master
>>
>> Entry on the feature dashboard 
>>
>> https://chromestatus.com/feature/6516079022571520
>>
>>
>> Risks
>>
>> Interoperability and Compatibility
>>
>> Safari and Firefox have has already shipped these metrics in the spec.
>>
>>
>>
>> Firefox:  
>> Shipped

Re: [blink-dev] Intent to Ship: Baselines in New TextMetrics API in Canvas

2023-08-22 Thread 'Ashley Gullen' via blink-dev 
There is still this open issue about inconsistent TextMetrics measurements
across browsers:
https://bugs.chromium.org/p/chromium/issues/detail?id=1183752
I think it may involve this unresolved spec issue:
https://github.com/whatwg/html/issues/6731

This is causing us constant annoying compatibility problems across browsers
- we just can't draw or align text in a canvas consistently across browsers
and our customers keep complaining about it. Shouldn't these issues be
sorted out before adding even more text metrics?

On Tue, 22 Aug 2023 at 00:14, 'TAMURA, Kent' via blink-dev <
blink-dev@chromium.org> wrote:

> LGTM3.
>
>
> On Tue, Aug 22, 2023 at 5:11 AM Chris Harrelson 
> wrote:
>
>> LGTM2
>>
>> On Mon, Aug 21, 2023 at 1:01 PM Mike Taylor 
>> wrote:
>>
>>> LGTM1
>>> On 8/21/23 1:52 PM, Yi Xu wrote:
>>>
>>> Hi Yoav,
>>>
>>> In first attempt link
>>> ,
>>> 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
>>> ,
>>> we shipped actualBoundingBoxLeft, actualBoundingBoxRight, 
>>> fontBoundingBoxAscent,
>>> fontBoundingBoxDescent, actualBoundingBoxAscent, actualBoundingBoxDescent,
>>> emHeightAscent and emHeightDescent.
>>> In third attempt
>>> ,
>>> 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 
>>> wrote:
>>>


 On Fri, Aug 18, 2023 at 8:25 PM Yi Xu  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
> 
> , second attempt
> , 
> third
> attempt)
> 
> .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) has strong user
> support (23 stars).
>
> Blink component Blink>Canvas
> 
>
> Is this feature supported on all six Blink platforms (Windows, Mac,
> Linux, Chrome OS, Android, and Android WebView)?
>
> Yes
>
>
> Is this feature fully tested by web-platform-tests
> ?
> Link to test suite results from wpt.fyi
> .
>
>
> https://wpt.fyi/results/html/canvas/element/text/2d.text.measure.baselines.html?label=experimental=master
>
> Entry on the feature dashboard 
>
> https://chromestatus.com/feature/6516079022571520
>
>
> Risks
>
> Interoperability and Compatibility
>
> Safari and Firefox have has already shipped these metrics in the spec.
>
>
>
> Firefox:  
> Shipped 
>
> Safari: Shipped 
>
>
>
> 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
>

Re: [blink-dev] Intent to Ship: Baselines in New TextMetrics API in Canvas

2023-08-21 Thread 'TAMURA, Kent' via blink-dev 
LGTM3.


On Tue, Aug 22, 2023 at 5:11 AM Chris Harrelson 
wrote:

> LGTM2
>
> On Mon, Aug 21, 2023 at 1:01 PM Mike Taylor 
> wrote:
>
>> LGTM1
>> On 8/21/23 1:52 PM, Yi Xu wrote:
>>
>> Hi Yoav,
>>
>> In first attempt link
>> ,
>> 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
>> , we
>> shipped actualBoundingBoxLeft, actualBoundingBoxRight, fontBoundingBoxAscent,
>> fontBoundingBoxDescent, actualBoundingBoxAscent, actualBoundingBoxDescent,
>> emHeightAscent and emHeightDescent.
>> In third attempt
>> ,
>> 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 
>> wrote:
>>
>>>
>>>
>>> On Fri, Aug 18, 2023 at 8:25 PM Yi Xu  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
 
 , second attempt
 , third
 attempt)
 
 .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) has strong user
 support (23 stars).

 Blink component Blink>Canvas
 

 Is this feature supported on all six Blink platforms (Windows, Mac,
 Linux, Chrome OS, Android, and Android WebView)?

 Yes


 Is this feature fully tested by web-platform-tests
 ?
 Link to test suite results from wpt.fyi
 .


 https://wpt.fyi/results/html/canvas/element/text/2d.text.measure.baselines.html?label=experimental=master

 Entry on the feature dashboard 

 https://chromestatus.com/feature/6516079022571520


 Risks

 Interoperability and Compatibility

 Safari and Firefox have has already shipped these metrics in the spec.



 Firefox:  Shipped
 

 Safari: Shipped 



 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

 --
 You received this message because you are subscribed to the Google
 Groups "blink-dev" group.
 To unsubscribe from this group and stop receiving emails from it, send
 an email to blink-dev+unsubscr...@chromium.org.
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Re: [blink-dev] Intent to Ship: Baselines in New TextMetrics API in Canvas

2023-08-21 Thread Chris Harrelson 
LGTM2

On Mon, Aug 21, 2023 at 1:01 PM Mike Taylor  wrote:

> LGTM1
> On 8/21/23 1:52 PM, Yi Xu wrote:
>
> Hi Yoav,
>
> In first attempt link
> ,
> 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
> , we
> shipped actualBoundingBoxLeft, actualBoundingBoxRight, fontBoundingBoxAscent,
> fontBoundingBoxDescent, actualBoundingBoxAscent, actualBoundingBoxDescent,
> emHeightAscent and emHeightDescent.
> In third attempt
> ,
> 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 
> wrote:
>
>>
>>
>> On Fri, Aug 18, 2023 at 8:25 PM Yi Xu  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
>>> 
>>> , second attempt
>>> , third
>>> attempt)
>>> 
>>> .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) has strong user
>>> support (23 stars).
>>>
>>> Blink component Blink>Canvas
>>> 
>>>
>>> Is this feature supported on all six Blink platforms (Windows, Mac,
>>> Linux, Chrome OS, Android, and Android WebView)?
>>>
>>> Yes
>>>
>>>
>>> Is this feature fully tested by web-platform-tests
>>> ?
>>> Link to test suite results from wpt.fyi
>>> .
>>>
>>>
>>> https://wpt.fyi/results/html/canvas/element/text/2d.text.measure.baselines.html?label=experimental=master
>>>
>>> Entry on the feature dashboard 
>>>
>>> https://chromestatus.com/feature/6516079022571520
>>>
>>>
>>> Risks
>>>
>>> Interoperability and Compatibility
>>>
>>> Safari and Firefox have has already shipped these metrics in the spec.
>>>
>>>
>>>
>>> Firefox:  Shipped
>>> 
>>>
>>> Safari: Shipped 
>>>
>>>
>>>
>>> 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
>>>
>>> --
>>> You received this message because you are subscribed to the Google
>>> Groups "blink-dev" group.
>>> To unsubscribe from this group and stop receiving emails from it, send
>>> an email to blink-dev+unsubscr...@chromium.org.
>>> To view this discussion on the web visit
>>> https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAC3hXJeKqXo9QKyreEM%2BqiNM0gi_us%3DWZ_-17AxpMg-bF%2BoLkA%40mail.gmail.com
>>> 
>>> .
>>>
>> --
> You received this message because you are subscribed to the Google Groups
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> To unsubscribe from this group and stop receiving emails from it,

Re: [blink-dev] Intent to Ship: Baselines in New TextMetrics API in Canvas

2023-08-21 Thread Mike Taylor 

LGTM1

On 8/21/23 1:52 PM, Yi Xu wrote:

Hi Yoav,

In first attempt link 
, 
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 
, 
we shipped 
actualBoundingBoxLeft, actualBoundingBoxRight, fontBoundingBoxAscent, 
fontBoundingBoxDescent, actualBoundingBoxAscent, 
actualBoundingBoxDescent, emHeightAscent and emHeightDescent.
In third attempt 
, 
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  
wrote:




On Fri, Aug 18, 2023 at 8:25 PM Yi Xu  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

,
 second
attempt
,
third attempt)

.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
) has strong user support (23 stars).


Blink component

Blink>Canvas



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

?
Link to test suite results fromwpt.fyi
.


https://wpt.fyi/results/html/canvas/element/text/2d.text.measure.baselines.html?label=experimental=master




Entry on thefeature dashboard 

https://chromestatus.com/feature/6516079022571520



Risks

Interoperability and Compatibility

Safari and Firefox have has already shipped these metrics in
the spec.

Firefox:Shipped


Safari:Shipped 

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


-- 
You received this message because you are subscribed to the

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it, send an email to blink-dev+unsubscr...@chromium.org.
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Re: [blink-dev] Intent to Ship: Baselines in New TextMetrics API in Canvas

2023-08-21 Thread Yi Xu 
Hi Yoav,

In first attempt link
,
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
, we
shipped actualBoundingBoxLeft, actualBoundingBoxRight, fontBoundingBoxAscent,
fontBoundingBoxDescent, actualBoundingBoxAscent, actualBoundingBoxDescent,
emHeightAscent and emHeightDescent.
In third attempt
,
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  wrote:

>
>
> On Fri, Aug 18, 2023 at 8:25 PM Yi Xu  wrote:
>
>> Contact emailsyi...@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
>> 
>> , second attempt
>> , third
>> attempt)
>> 
>> .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) has strong user
>> support (23 stars).
>>
>> Blink componentBlink>Canvas
>> 
>>
>> Is this feature supported on all six Blink platforms (Windows, Mac,
>> Linux, Chrome OS, Android, and Android WebView)?
>>
>> Yes
>>
>>
>> Is this feature fully tested by web-platform-tests
>> ?
>> Link to test suite results from wpt.fyi
>> .
>>
>>
>> https://wpt.fyi/results/html/canvas/element/text/2d.text.measure.baselines.html?label=experimental=master
>>
>> Entry on the feature dashboard 
>>
>> https://chromestatus.com/feature/6516079022571520
>>
>>
>> Risks
>>
>> Interoperability and Compatibility
>>
>> Safari and Firefox have has already shipped these metrics in the spec.
>>
>>
>>
>> Firefox:  Shipped
>> 
>>
>> Safari: Shipped 
>>
>>
>>
>> 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
>>
>> --
>> You received this message because you are subscribed to the Google Groups
>> "blink-dev" group.
>> To unsubscribe from this group and stop receiving emails from it, send an
>> email to blink-dev+unsubscr...@chromium.org.
>> To view this discussion on the web visit
>> https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAC3hXJeKqXo9QKyreEM%2BqiNM0gi_us%3DWZ_-17AxpMg-bF%2BoLkA%40mail.gmail.com
>> 
>> .
>>
>

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Re: [blink-dev] Intent to Ship: Baselines in New TextMetrics API in Canvas

2023-08-20 Thread Yoav Weiss 
On Fri, Aug 18, 2023 at 8:25 PM Yi Xu  wrote:

> Contact emailsyi...@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
> 
> , second attempt
> , third
> attempt)
> 
> .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) has strong user
> support (23 stars).
>
> Blink componentBlink>Canvas
> 
>
> Is this feature supported on all six Blink platforms (Windows, Mac, Linux,
> Chrome OS, Android, and Android WebView)?
>
> Yes
>
>
> Is this feature fully tested by web-platform-tests
> ?
> Link to test suite results from wpt.fyi
> .
>
>
> https://wpt.fyi/results/html/canvas/element/text/2d.text.measure.baselines.html?label=experimental=master
>
> Entry on the feature dashboard 
>
> https://chromestatus.com/feature/6516079022571520
>
>
> Risks
>
> Interoperability and Compatibility
>
> Safari and Firefox have has already shipped these metrics in the spec.
>
>
>
> Firefox:  Shipped
> 
>
> Safari: Shipped 
>
>
>
> 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
>
> --
> You received this message because you are subscribed to the Google Groups
> "blink-dev" group.
> To unsubscribe from this group and stop receiving emails from it, send an
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[blink-dev] Intent to Ship: Baselines in New TextMetrics API in Canvas

2023-08-18 Thread Yi Xu 
Contact emailsyi...@chromium.org, aaro...@chromium.org, fs...@chromium.org

Explainer
https://learn.microsoft.com/en-us/typography/opentype/spec/baselinetags

Specificationhttps://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

, second attempt
, third
attempt)

.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*
.


The original feature bug (https://crbug.com/277215) has strong user support
(23 stars).

Blink componentBlink>Canvas


Is this feature supported on all six Blink platforms (Windows, Mac, Linux,
Chrome OS, Android, and Android WebView)?

Yes


Is this feature fully tested by web-platform-tests
?
Link to test suite results from wpt.fyi
.

https://wpt.fyi/results/html/canvas/element/text/2d.text.measure.baselines.html?label=experimental=master

Entry on the feature dashboard 

https://chromestatus.com/feature/6516079022571520


Risks

Interoperability and Compatibility

Safari and Firefox have has already shipped these metrics in the spec.



Firefox:  Shipped


Safari: Shipped 



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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