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SPIKE - Add v2 font #1356

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Closed

SPIKE - Add v2 font #1356

wants to merge 13 commits into from

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dashouse
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@dashouse dashouse commented May 16, 2019

This PR uses v2 of the font.

  • Adds new font files, reducing the amount of files from 12 to 8
  • Significantly better alignment with the baseline of Helvetica / Arial*
  • Tabular numbers are now rolled up in to the Light or Bold weights and set with font-feature-settings (CSS applied to existing mixin so $tabular: true still works)
  • NTA specific overrides on "Button" and "Tag" have been removed

*This is somewhat dependent on font size. Frustratingly for us 19px is still not entirely aligned.

Tag before
before

Tag after
after

Header before (Note position of Service name - Component may need adjustment of crown and top padding)
Screen Shot 2019-05-16 at 14 05 27

Header after
Screen Shot 2019-05-16 at 14 05 38

Discoveries

  • FIXED, see comment below. The header appears to have got larger (65px to 66.16px (1.78%)) suggesting there is a change to how the font takes up space. This was to do with a mixture of the SVG height and vertical position. The header is now 60px regardless of font.

Overlay of example page to show the difference.
Note general page scaffolding is intact, images, footer etc in exactly the same position despite text shift.

overlayv2

@govuk-design-system-ci govuk-design-system-ci temporarily deployed to govuk-frontend-review-pr-1356 May 16, 2019 13:27 Inactive
@govuk-design-system-ci govuk-design-system-ci temporarily deployed to govuk-frontend-review-pr-1356 May 17, 2019 06:59 Inactive
@govuk-design-system-ci govuk-design-system-ci temporarily deployed to govuk-frontend-review-pr-1356 May 17, 2019 07:29 Inactive
@@ -171,7 +171,13 @@

@mixin govuk-font($size, $weight: regular, $tabular: false, $line-height: false) {
@if $tabular {
@include govuk-typography-common($font-family: $govuk-font-family-tabular);
@include govuk-typography-common;
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I think this might need the compatibility stuff here as well

@@ -21,47 +21,26 @@

@font-face {
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I believe that we don't need to have the old fonts around here since GOVUK_Template will supply these?

This font-face is already automatically excluded when certain compat flags are present, something to double check.

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The old fonts are already gone, unless you mean get rid of the .eot versions etc?

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When legacy mode is enabled, GOV.UK Frontend font-face declarations are not output and GOV.UK Frontend relies on GOVUK_Template being loaded alongside.

So this means we don't need to keep the old fonts around in GOV.UK Frontend, but we should check this.

/// @type List
/// @access public

$govuk-font-family-nta-tabular: "ntatabularnumbers", $govuk-font-family-nta;
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Again probably will need to keep this around for the legacy mode...?

@govuk-design-system-ci govuk-design-system-ci temporarily deployed to govuk-frontend-review-pr-1356 May 17, 2019 10:23 Inactive
@govuk-design-system-ci govuk-design-system-ci temporarily deployed to govuk-frontend-review-pr-1356 May 20, 2019 07:44 Inactive
@dashouse
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dashouse commented May 20, 2019

Header issue resolved:

With NTA (60px)
Screen Shot 2019-05-20 at 08 51 07

With Arial (60px)
Screen Shot 2019-05-20 at 08 50 55

GOV.UK's header is 53px (3px padding top is to compensate for transport)
Current header in the design system is 65px (-10 for blue border = 55px)

This change makes the header 60px (50px without border) regardless of font. Which is what I believe to be the desired size.

@govuk-design-system-ci govuk-design-system-ci temporarily deployed to govuk-frontend-review-pr-1356 May 21, 2019 20:53 Inactive
@aliuk2012 aliuk2012 changed the base branch from master to v3 May 21, 2019 20:53
I've added this import for compatibility variables because in the design
system there is a method that uses sass-exports to export the _colours palette
but fails to run because the compatibility variables cannot be set.
@govuk-design-system-ci govuk-design-system-ci temporarily deployed to govuk-frontend-review-pr-1356 May 22, 2019 07:12 Inactive
@Nooshu
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Nooshu commented May 22, 2019

I'd recommend removing the EOT versions of the fonts from the @font-face declaration. Only IE support this font format (including IE11). All but IE8 also support other font formats that are available. According to the last 30 days GOV.UK analytics, IE8 has had 9,054 "users" out of 50,566,007 (0.018%).

EOT files can be compressed with Gzip (or Zopfli for 5% better compression), but even with this compression we are asking old browsers on legacy devices to download a fairly large amount of data (60KB) for unhinted versions of the font (only Vista and XP require hinted versions). These browsers and devices are the least equipped to manage these assets.

Font Size (bytes) Saving (bytes) Saving (%)
Bold EOT uncompressed 58932 0 0
Bold EOT gzipped 30366 28566 48.4
Bold EOT zopfli 28115 30817 52.3
Light EOT uncompressed 58708 0 0
Light EOT gzipped 29885 28823 49.1
Light EOT zopfli 27589 31119 53

Totals: Uncompressed download - 118KB, Compressed (gzip) - 60KB, Compressed (Zopfli) - 56KB.

I'd say it's a better strategy for this small number of devices is to use the fallback font of Arial, and not have them require to download the additional EOT assets. Since the new font now corrects the glyph placement in the bounding box, the fallback will render correctly without the need for additional adjustments to the vertical placement.

If it is we decide to keep the EOT files in the @font-face declaration it's worth noting the container order will prevent IE9-11 from receiving the WOFF version of the font. Browsers pick the first font format it supports from the list. It will ignore any declarations after, (even if they are also supported). In the current setup IE9, 10 and 11 will download the EOT format even though they all support WOFF.

Since WOFF files are already compressed using Gzip compression, developers don't need to worry about enabling compression on the server. If developers forget to enable Gzip compression on the server for EOT files (since we can't provide compressed versions of the EOT files) these users will be downloading 118KB vs 83KB (WOFF). Due to all the hacks required to make fonts work properly in older versions of IE there looks to be no way around this. This seems like another good reason to remove the EOT sources from the declaration.

Recommended declaration

@font-face {
    font-family: "nta";
    src: govuk-font-url("light-68f0c84f0e-v2.woff2") format("woff2"),
         govuk-font-url("light-222368e53d-v2.woff") format("woff");
    font-weight: normal;
    font-style: normal;
    font-display: swap;
}

@font-face {
    font-family: "nta";
    src: govuk-font-url("bold-9561e2d007-v2.woff2") format("woff2"),
         govuk-font-url("bold-5d3836b441-v2.woff") format("woff");
    font-weight: bold;
    font-style: normal;
    font-display: swap;
}

@NickColley
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It won't block this work since it's already an issue, but we should consider making the logo entirely an image which includes the crown and the text, so that in browsers that don't have the font they still get the correct branding.

@NickColley NickColley added this to the v3.0.0 milestone May 28, 2019
aliuk2012 added a commit that referenced this pull request Jun 6, 2019
Embedded Open Type (.eot) is a proprietary format, which no other browsers use apart
from IE8 and older. As v2 font is so similiar to Arial, we have decided
to remove EOT format. This means that IE8 and older will not be downloading
any custom fonts like v1 and v2 of Transport but will instead use Arial by
default.

This commit also fixes an existing issue with IE 9-11 using EOT format
by default instead of WOFF. This is because the browser
would only look for and use the first format it finds that it supports.

Thanks goes to Matthew Hobbs (@Nooshu)[https://github.com/Nooshu] for this
recommendation.

An extract of Matt's recommendation can be found below and at this link:
#1356 (comment)

I'd recommend removing the EOT versions of the fonts from the `@font-face` declaration.
Only IE support this font format (including IE11). All but IE8 also support other font
formats that are available. According to the last 30 days GOV.UK analytics, IE8 has had
9,054 "users" out of 50,566,007 (0.018%).

EOT files can be compressed with Gzip (or Zopfli for 5% better compression),
but even with this compression we are asking old browsers on legacy devices
to download a fairly large amount of data (60KB) for unhinted versions of the
font ([only Vista and XP require hinted versions](https://docs.google.com/spreadsheets/d/1l2SKP9D3Fm5EVk10j9K1CUSg_jCkW7Pef60TzK0ZKlI/edit#gid=0)).
These browsers and devices are the least equipped to manage these assets.

Font | Size (bytes) | Saving (bytes) | Saving (%)
------------ | ------------- | ------------- | -------------
Bold EOT uncompressed | 58932 | 0 | 0
Bold EOT gzipped | 30366 | 28566 | 48.4
Bold EOT zopfli | 28115 | 30817 | 52.3
Light EOT uncompressed | 58708 | 0 | 0
Light EOT gzipped | 29885 | 28823 | 49.1
Light EOT zopfli | 27589 | 31119 | 53

**Totals**: Uncompressed download - 118KB, Compressed (gzip) - 60KB, Compressed (Zopfli) - 56KB.

I'd say it's a better strategy for this small number of devices is to use
the fallback font of Arial, and not have them require to download the
additional EOT assets. Since the new font now corrects the glyph placement
in the bounding box, the fallback will render correctly without the need for
additional adjustments to the vertical placement.

If it is we decide to keep the EOT files in the `@font-face` declaration
it's worth noting the container order will prevent IE9-11 from receiving
the WOFF version of the font. Browsers pick the first font format it supports
from the list. It will ignore any declarations after, (even if they are
also supported). In the current setup IE9, 10 and 11 will download the
EOT format even though they all support WOFF.

Since WOFF files are already compressed using Gzip compression, developers
don't need to worry about enabling compression on the server. If developers
forget to enable Gzip compression on the server for EOT files (since we
can't provide compressed versions of the EOT files) these users will be
downloading 118KB vs 83KB (WOFF). Due to [all the hacks required](https://www.paulirish.com/2009/bulletproof-font-face-implementation-syntax/)
to make fonts work properly in older versions of IE there looks to be no
way around this. This seems like another good reason to remove the EOT
sources from the declaration.

Recommended declaration
```css
@font-face {
    font-family: "nta";
    src: govuk-font-url("light-68f0c84f0e-v2.woff2") format("woff2"),
         govuk-font-url("light-222368e53d-v2.woff") format("woff");
    font-weight: normal;
    font-style: normal;
    font-display: swap;
}

@font-face {
    font-family: "nta";
    src: govuk-font-url("bold-9561e2d007-v2.woff2") format("woff2"),
         govuk-font-url("bold-5d3836b441-v2.woff") format("woff");
    font-weight: bold;
    font-style: normal;
    font-display: swap;
}
```
@aliuk2012
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This PR will be split into two different PR.

  1. Replacing v1 font with v2 (PR Update font to use v2 of GOV.UK Transport font. #1434)
  2. Removing NTA specific overrides on "Button" and "Tag" etc

aliuk2012 added a commit that referenced this pull request Jun 6, 2019
Embedded Open Type (.eot) is a proprietary format, which no other browsers use apart
from IE8 and older. As v2 font is so similiar to Arial, we have decided
to remove EOT format. This means that IE8 and older will not be downloading
any custom fonts like v1 and v2 of Transport but will instead use Arial by
default.

This commit also fixes an existing issue with IE 9-11 using EOT format
by default instead of WOFF. This is because the browser
would only look for and use the first format it finds that it supports.

Thanks goes to Matthew Hobbs (@Nooshu)[https://github.com/Nooshu] for this
recommendation.

An extract of Matt's recommendation can be found below and at this link:
#1356 (comment)

I'd recommend removing the EOT versions of the fonts from the `@font-face` declaration.
Only IE support this font format (including IE11). All but IE8 also support other font
formats that are available. According to the last 30 days GOV.UK analytics, IE8 has had
9,054 "users" out of 50,566,007 (0.018%).

EOT files can be compressed with Gzip (or Zopfli for 5% better compression),
but even with this compression we are asking old browsers on legacy devices
to download a fairly large amount of data (60KB) for unhinted versions of the
font ([only Vista and XP require hinted versions](https://docs.google.com/spreadsheets/d/1l2SKP9D3Fm5EVk10j9K1CUSg_jCkW7Pef60TzK0ZKlI/edit#gid=0)).
These browsers and devices are the least equipped to manage these assets.

Font | Size (bytes) | Saving (bytes) | Saving (%)
------------ | ------------- | ------------- | -------------
Bold EOT uncompressed | 58932 | 0 | 0
Bold EOT gzipped | 30366 | 28566 | 48.4
Bold EOT zopfli | 28115 | 30817 | 52.3
Light EOT uncompressed | 58708 | 0 | 0
Light EOT gzipped | 29885 | 28823 | 49.1
Light EOT zopfli | 27589 | 31119 | 53

**Totals**: Uncompressed download - 118KB, Compressed (gzip) - 60KB, Compressed (Zopfli) - 56KB.

I'd say it's a better strategy for this small number of devices is to use
the fallback font of Arial, and not have them require to download the
additional EOT assets. Since the new font now corrects the glyph placement
in the bounding box, the fallback will render correctly without the need for
additional adjustments to the vertical placement.

If it is we decide to keep the EOT files in the `@font-face` declaration
it's worth noting the container order will prevent IE9-11 from receiving
the WOFF version of the font. Browsers pick the first font format it supports
from the list. It will ignore any declarations after, (even if they are
also supported). In the current setup IE9, 10 and 11 will download the
EOT format even though they all support WOFF.

Since WOFF files are already compressed using Gzip compression, developers
don't need to worry about enabling compression on the server. If developers
forget to enable Gzip compression on the server for EOT files (since we
can't provide compressed versions of the EOT files) these users will be
downloading 118KB vs 83KB (WOFF). Due to [all the hacks required](https://www.paulirish.com/2009/bulletproof-font-face-implementation-syntax/)
to make fonts work properly in older versions of IE there looks to be no
way around this. This seems like another good reason to remove the EOT
sources from the declaration.

Recommended declaration
```css
@font-face {
    font-family: "nta";
    src: govuk-font-url("light-68f0c84f0e-v2.woff2") format("woff2"),
         govuk-font-url("light-222368e53d-v2.woff") format("woff");
    font-weight: normal;
    font-style: normal;
    font-display: swap;
}

@font-face {
    font-family: "nta";
    src: govuk-font-url("bold-9561e2d007-v2.woff2") format("woff2"),
         govuk-font-url("bold-5d3836b441-v2.woff") format("woff");
    font-weight: bold;
    font-style: normal;
    font-display: swap;
}
```
aliuk2012 added a commit that referenced this pull request Jun 7, 2019
Embedded Open Type (.eot) is a proprietary format, which no other browsers use apart
from IE8 and older. As v2 font is so similiar to Arial, we have decided
to remove EOT format. This means that IE8 and older will not be downloading
any custom fonts like v1 and v2 of Transport but will instead use Arial by
default.

This commit also fixes an existing issue with IE 9-11 using EOT format
by default instead of WOFF. This is because the browser
would only look for and use the first format it finds that it supports.

Thanks goes to Matthew Hobbs (@Nooshu)[https://github.com/Nooshu] for this
recommendation.

An extract of Matt's recommendation can be found below and at this link:
#1356 (comment)

I'd recommend removing the EOT versions of the fonts from the `@font-face` declaration.
Only IE support this font format (including IE11). All but IE8 also support other font
formats that are available. According to the last 30 days GOV.UK analytics, IE8 has had
9,054 "users" out of 50,566,007 (0.018%).

EOT files can be compressed with Gzip (or Zopfli for 5% better compression),
but even with this compression we are asking old browsers on legacy devices
to download a fairly large amount of data (60KB) for unhinted versions of the
font ([only Vista and XP require hinted versions](https://docs.google.com/spreadsheets/d/1l2SKP9D3Fm5EVk10j9K1CUSg_jCkW7Pef60TzK0ZKlI/edit#gid=0)).
These browsers and devices are the least equipped to manage these assets.

Font | Size (bytes) | Saving (bytes) | Saving (%)
------------ | ------------- | ------------- | -------------
Bold EOT uncompressed | 58932 | 0 | 0
Bold EOT gzipped | 30366 | 28566 | 48.4
Bold EOT zopfli | 28115 | 30817 | 52.3
Light EOT uncompressed | 58708 | 0 | 0
Light EOT gzipped | 29885 | 28823 | 49.1
Light EOT zopfli | 27589 | 31119 | 53

**Totals**: Uncompressed download - 118KB, Compressed (gzip) - 60KB, Compressed (Zopfli) - 56KB.

I'd say it's a better strategy for this small number of devices is to use
the fallback font of Arial, and not have them require to download the
additional EOT assets. Since the new font now corrects the glyph placement
in the bounding box, the fallback will render correctly without the need for
additional adjustments to the vertical placement.

If it is we decide to keep the EOT files in the `@font-face` declaration
it's worth noting the container order will prevent IE9-11 from receiving
the WOFF version of the font. Browsers pick the first font format it supports
from the list. It will ignore any declarations after, (even if they are
also supported). In the current setup IE9, 10 and 11 will download the
EOT format even though they all support WOFF.

Since WOFF files are already compressed using Gzip compression, developers
don't need to worry about enabling compression on the server. If developers
forget to enable Gzip compression on the server for EOT files (since we
can't provide compressed versions of the EOT files) these users will be
downloading 118KB vs 83KB (WOFF). Due to [all the hacks required](https://www.paulirish.com/2009/bulletproof-font-face-implementation-syntax/)
to make fonts work properly in older versions of IE there looks to be no
way around this. This seems like another good reason to remove the EOT
sources from the declaration.

Recommended declaration
```css
@font-face {
    font-family: "nta";
    src: govuk-font-url("light-68f0c84f0e-v2.woff2") format("woff2"),
         govuk-font-url("light-222368e53d-v2.woff") format("woff");
    font-weight: normal;
    font-style: normal;
    font-display: swap;
}

@font-face {
    font-family: "nta";
    src: govuk-font-url("bold-9561e2d007-v2.woff2") format("woff2"),
         govuk-font-url("bold-5d3836b441-v2.woff") format("woff");
    font-weight: bold;
    font-style: normal;
    font-display: swap;
}
```
@aliuk2012 aliuk2012 mentioned this pull request Jun 10, 2019
33 tasks
@aliuk2012
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Closing this as #1434 and #1441 have been merged

@aliuk2012 aliuk2012 closed this Jun 11, 2019
@aliuk2012 aliuk2012 deleted the add-v2-font branch June 11, 2019 14:43
aliuk2012 added a commit that referenced this pull request Jun 14, 2019
Embedded Open Type (.eot) is a proprietary format, which no other browsers use apart
from IE8 and older. As v2 font is so similiar to Arial, we have decided
to remove EOT format. This means that IE8 and older will not be downloading
any custom fonts like v1 and v2 of Transport but will instead use Arial by
default.

This commit also fixes an existing issue with IE 9-11 using EOT format
by default instead of WOFF. This is because the browser
would only look for and use the first format it finds that it supports.

Thanks goes to Matthew Hobbs (@Nooshu)[https://github.com/Nooshu] for this
recommendation.

An extract of Matt's recommendation can be found below and at this link:
#1356 (comment)

I'd recommend removing the EOT versions of the fonts from the `@font-face` declaration.
Only IE support this font format (including IE11). All but IE8 also support other font
formats that are available. According to the last 30 days GOV.UK analytics, IE8 has had
9,054 "users" out of 50,566,007 (0.018%).

EOT files can be compressed with Gzip (or Zopfli for 5% better compression),
but even with this compression we are asking old browsers on legacy devices
to download a fairly large amount of data (60KB) for unhinted versions of the
font ([only Vista and XP require hinted versions](https://docs.google.com/spreadsheets/d/1l2SKP9D3Fm5EVk10j9K1CUSg_jCkW7Pef60TzK0ZKlI/edit#gid=0)).
These browsers and devices are the least equipped to manage these assets.

Font | Size (bytes) | Saving (bytes) | Saving (%)
------------ | ------------- | ------------- | -------------
Bold EOT uncompressed | 58932 | 0 | 0
Bold EOT gzipped | 30366 | 28566 | 48.4
Bold EOT zopfli | 28115 | 30817 | 52.3
Light EOT uncompressed | 58708 | 0 | 0
Light EOT gzipped | 29885 | 28823 | 49.1
Light EOT zopfli | 27589 | 31119 | 53

**Totals**: Uncompressed download - 118KB, Compressed (gzip) - 60KB, Compressed (Zopfli) - 56KB.

I'd say it's a better strategy for this small number of devices is to use
the fallback font of Arial, and not have them require to download the
additional EOT assets. Since the new font now corrects the glyph placement
in the bounding box, the fallback will render correctly without the need for
additional adjustments to the vertical placement.

If it is we decide to keep the EOT files in the `@font-face` declaration
it's worth noting the container order will prevent IE9-11 from receiving
the WOFF version of the font. Browsers pick the first font format it supports
from the list. It will ignore any declarations after, (even if they are
also supported). In the current setup IE9, 10 and 11 will download the
EOT format even though they all support WOFF.

Since WOFF files are already compressed using Gzip compression, developers
don't need to worry about enabling compression on the server. If developers
forget to enable Gzip compression on the server for EOT files (since we
can't provide compressed versions of the EOT files) these users will be
downloading 118KB vs 83KB (WOFF). Due to [all the hacks required](https://www.paulirish.com/2009/bulletproof-font-face-implementation-syntax/)
to make fonts work properly in older versions of IE there looks to be no
way around this. This seems like another good reason to remove the EOT
sources from the declaration.

Recommended declaration
```css
@font-face {
    font-family: "nta";
    src: govuk-font-url("light-68f0c84f0e-v2.woff2") format("woff2"),
         govuk-font-url("light-222368e53d-v2.woff") format("woff");
    font-weight: normal;
    font-style: normal;
    font-display: swap;
}

@font-face {
    font-family: "nta";
    src: govuk-font-url("bold-9561e2d007-v2.woff2") format("woff2"),
         govuk-font-url("bold-5d3836b441-v2.woff") format("woff");
    font-weight: bold;
    font-style: normal;
    font-display: swap;
}
```
aliuk2012 added a commit that referenced this pull request Jun 14, 2019
Embedded Open Type (.eot) is a proprietary format, which no other browsers use apart
from IE8 and older. As v2 font is so similiar to Arial, we have decided
to remove EOT format. This means that IE8 and older will not be downloading
any custom fonts like v1 and v2 of Transport but will instead use Arial by
default.

This commit also fixes an existing issue with IE 9-11 using EOT format
by default instead of WOFF. This is because the browser
would only look for and use the first format it finds that it supports.

Thanks goes to Matthew Hobbs (@Nooshu)[https://github.com/Nooshu] for this
recommendation.

An extract of Matt's recommendation can be found below and at this link:
#1356 (comment)

I'd recommend removing the EOT versions of the fonts from the `@font-face` declaration.
Only IE support this font format (including IE11). All but IE8 also support other font
formats that are available. According to the last 30 days GOV.UK analytics, IE8 has had
9,054 "users" out of 50,566,007 (0.018%).

EOT files can be compressed with Gzip (or Zopfli for 5% better compression),
but even with this compression we are asking old browsers on legacy devices
to download a fairly large amount of data (60KB) for unhinted versions of the
font ([only Vista and XP require hinted versions](https://docs.google.com/spreadsheets/d/1l2SKP9D3Fm5EVk10j9K1CUSg_jCkW7Pef60TzK0ZKlI/edit#gid=0)).
These browsers and devices are the least equipped to manage these assets.

Font | Size (bytes) | Saving (bytes) | Saving (%)
------------ | ------------- | ------------- | -------------
Bold EOT uncompressed | 58932 | 0 | 0
Bold EOT gzipped | 30366 | 28566 | 48.4
Bold EOT zopfli | 28115 | 30817 | 52.3
Light EOT uncompressed | 58708 | 0 | 0
Light EOT gzipped | 29885 | 28823 | 49.1
Light EOT zopfli | 27589 | 31119 | 53

**Totals**: Uncompressed download - 118KB, Compressed (gzip) - 60KB, Compressed (Zopfli) - 56KB.

I'd say it's a better strategy for this small number of devices is to use
the fallback font of Arial, and not have them require to download the
additional EOT assets. Since the new font now corrects the glyph placement
in the bounding box, the fallback will render correctly without the need for
additional adjustments to the vertical placement.

If it is we decide to keep the EOT files in the `@font-face` declaration
it's worth noting the container order will prevent IE9-11 from receiving
the WOFF version of the font. Browsers pick the first font format it supports
from the list. It will ignore any declarations after, (even if they are
also supported). In the current setup IE9, 10 and 11 will download the
EOT format even though they all support WOFF.

Since WOFF files are already compressed using Gzip compression, developers
don't need to worry about enabling compression on the server. If developers
forget to enable Gzip compression on the server for EOT files (since we
can't provide compressed versions of the EOT files) these users will be
downloading 118KB vs 83KB (WOFF). Due to [all the hacks required](https://www.paulirish.com/2009/bulletproof-font-face-implementation-syntax/)
to make fonts work properly in older versions of IE there looks to be no
way around this. This seems like another good reason to remove the EOT
sources from the declaration.

Recommended declaration
```css
@font-face {
    font-family: "nta";
    src: govuk-font-url("light-68f0c84f0e-v2.woff2") format("woff2"),
         govuk-font-url("light-222368e53d-v2.woff") format("woff");
    font-weight: normal;
    font-style: normal;
    font-display: swap;
}

@font-face {
    font-family: "nta";
    src: govuk-font-url("bold-9561e2d007-v2.woff2") format("woff2"),
         govuk-font-url("bold-5d3836b441-v2.woff") format("woff");
    font-weight: bold;
    font-style: normal;
    font-display: swap;
}
```
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5 participants