<?php
/*************************************************************************************************************************
* Author: Riccardo Castagna MBA, PHP developer - Palermo (ITALY) https://api.whatsapp.com/send?phone=393315954155 *
* This php package solves the problem to charge an external font resource *
* with the "controlling font performance" using font-display options. *
* This option is useful, to fast load the external font and in general to have the control over browser behavioral *
* and, in particular, over how the different browsers have to load the external font. *
* This option is useful to make all text remains visible during web font loads, *
* leveraging the font-display CSS feature to ensure text is user-visible while web fonts are loading. *
* At the moment is no possible to add at any external font resource the font-display options, *
* when you call the query, for example, through google font API: *
* "https://fonts.googleapis.com/css?family=Montserrat+Alternates%3A300%2C500" *
* and you wish to add the descriptor param: "&font-display=fallback" *
* making something like this query: *
* "https://fonts.googleapis.com/css?family=Montserrat+Alternates%3A300%2C500&font-display=fallback". *
* Also with the alternative method using @import url(//fonts.googleapis.com/css?family=Open+Sans); inside css you are *
* not able to set up the values for font-display. And not even, I think I'm not wrong (I gave only a quick *
* look at this library), with the JavaScript library: *
* Web Font Loader: https://developers.google.com/fonts/docs/webfont_loader *
* At the moment the only way is the manual set up for each *
* css element: p {font-family: 'MyWebFont', fallback, sans-serif;} *
* As far as I know, google or someone else has not yet solved this issue and, to work, *
* the "font-display" descriptor option must be inserted as value inside the css function @font-face{...}. *
* *
* A possible way is, to use the PHP to manipulate this external resourse and add *
* the font-display option param inside the css function, moreover, in this way, the API keys, when these are necessary, *
* will be hidden. *
* With this php class there is also the possibility (VIEW:ADVANCED CLASS USAGE EXAMPLE N?2 FILE: INDEX_2.PHP) *
* to load the external fonts all together simultaneously, index_2.php. *
* To avoid changing this demo into a cyber attack to google servers, and if we want to prevent *
* google killing me and you; I joke, obviously, I joke ... ;), in the example N 2, I have entered the possibility, *
* for the external font files to be stored locally setting a param option: true for locally stored and false for not. *
* Since, usually, we don't change fonts every day, why we have to connect each time to this external resources ? *
* Is it necessary .... ? My thought is no, it is not necessary, instead, it need to set the .htaccess file with *
* a long time cache for the font files. *
* In the EXAMPLE TWO I have loaded seven different font simultaneously from only one server, *
* seven are too much, but I did it only for testing to show *
* that also in this case, with seven different fonts, all text remains visible with *
* the set up of the font-display during web fonts load. *
* Simultaneously, when the param option is set to true, *
* became only the check of the server to the external font resource, and the resources are downloaded only *
* if locally don't exists. *
* To avoid the critical request chain https://developers.google.com/web/tools/lighthouse/audits/critical-request-chains *
* I have set up to defer (load asynchronously) the style with a small escamotage: *
* <style media="none" onload="if(media!='all')media='all'" > * *
* *
* SIMPLE CLASS USAGE EXAMPLE N?1 FILE:INDEX.PHP (FONT-DISPLAY YES, NO SIMULTANEOUSLY CHECK, *
* NO FONT FILES ARE STORED LOCALLY, .HTACCESS CACHE YES); *
* $ref= new Fontperformance; *
* $font_1 = $ref->fontdisplay("link_to_font_api","fallback"); *
* $font_2 = $ref->fontdisplay("link_to_font_api","auto"); *
* Where param 1 is a string, is the link to external font resource, in this example through google font api. *
* param 2 is a string, is the performance controlling option. Possible values are: *
* auto | block | swap | fallback | optional *
* *
* ADVANCED CLASS USAGE EXAMPLE N?2 FILE:INDEX_2.PHP (FONT-DISPLAY YES, SIMULTANEOUSLY CHECK YES, *
* ALL FONT FILES ARE STORED LOCALLY IF LOCALLY DO NOT EXIST, .HTACCESS CACHE YES); *
* $ref= new Fontperformance; *
* $apilink = array("link_to_font_api_1","link_to_font_api_n", ....); *
* $ref->multi_simul_fontdisplay($apilink,"fallback", true ); *
* where the params1 is an array with all links to the font api, it's good, also, for only one font, *
* and where the param 2 is a string, is the performance controlling option. Possible values are: *
* auto | block | swap | fallback | optional , this will return an array with all fonts, *
* param 3: true o false, true for storing locally the exernal fonts, false for not storing, (default value is false). *
* *
* For a complete reference guide about font-display descriptor values please consult: *
* https://developers.google.com/web/updates/2016/02/font-display *
* https://www.w3.org/TR/css-fonts-4/#font-display-font-feature-values *
**************************************************************************************************************************/
include_once("./lib/class.fontperformance.php");
$ref= new Fontperformance;
$font_display = $ref->fontdisplay("https://fonts.googleapis.com/css?family=Montserrat+Alternates","fallback");
$font_display_2 = $ref->fontdisplay("https://fonts.googleapis.com/css?family=Tangerine","fallback");
?>
<!DOCTYPE html>
<html lang='it'>
<head>
<title>Controlling Font Performance with font-display</title>
<meta charset='utf-8'>
<meta name='description' content='Controlling Font Performance with font-display'>
<meta name='keywords' content='Font Performance font-display'>
<meta name='author' content='Riccardo Castagna'>
<meta name='robots' content='all'>
<meta name="viewport" content="width=device-width, initial-scale=1">
<!-- <meta http-equiv='X-UA-Compatible' content='IE=edge'> -->
<link href='./php-icon.png' rel='shortcut icon' type='image/png'>
<style media="none" onload="if(media!='all')media='all'" >
<?php echo $font_display, $font_display_2; ?>
body {
margin: 0px;
padding: 0px;
}
h1,h2, .montserrat {font-family:"Montserrat Alternates";}
.tangerine {font-family:"Tangerine";font-size: 40px;}
h1{
font-size: 35px;
text-align: center;
}
h2 {font-size: 28px;text-align: center;}
p {
font-size: 16px;
}
.title{
width:100%;
}
</style>
</head>
<body>
<div class="title">
<h1 >Controlling Font Performance with font-display, example n°1</h1>
<h2 >FONT-DISPLAY YES, NO SIMULTANEOUSLY CHECK,<br> NO FONT FILES ARE STORED LOCALLY</h2>
</div>
<p class="montserrat"> This php package solves the problem to charge an external font resource<br>
with the <strong>"controlling font performance"</strong> using font-display options.<br><br>
This option is useful, to fast load the external font and in general to have the control over browser behavioral<br>
and, in particular,<br> over how the different browsers have to load the external font.<br><br>
<strong>This option is useful to make all text remains visible during web font loads,<br>
leveraging the font-display CSS feature to ensure text is user-visible while web fonts are loading.</strong><br><br>
At the moment is no possible to add at any external font resource the font-display options,<br>
when you call the query, for example, through google font API:<br>
"https://fonts.googleapis.com/css?family=Montserrat+Alternates%3A300%2C500"<br>
and you wish to add the descriptor param: "&font-display=fallback"<br>
making something like this query:<br>
"https://fonts.googleapis.com/css?family=Montserrat+Alternates%3A300%2C500&font-display=fallback".<br>
Also with the alternative method using @import url(//fonts.googleapis.com/css?family=Open+Sans); inside css you are<br>
not able to set up the values for font-display.<br> And not even, I think I'm not wrong (I gave only a quick<br>
look at this library), with the JavaScript library:<br>
<a href="https://developers.google.com/fonts/docs/webfont_loader">Web Font Loader </a><br>
At the moment the only way is the manual set up for each<br>
css element: p {font-family: 'MyWebFont', fallback, sans-serif;}<br><br>
As far as I know, google or someone else has not yet solved this issue and, to work,<br>
the "font-display" descriptor option must be inserted as value inside the css function @font-face{...}.<br><br>
In short,<a href="https://www.w3.org/TR/css-fonts-4/#font-display-font-feature-values">as reported by the W3C</a>, when a font is served by a third-party font foundry,<br> the developer does not control the @font-face rules[..],<br>
the importance to set a default policy for an entire font-family<br> is also useful to avoid the ransom note effect (i.e. mismatched font faces).<br><br>
<strong> A possible way is, to use the PHP to manipulate this external resourse and add<br>
the font-display option param inside the css function, moreover, in this way, the API keys, when these are necessary,<br>
will be hidden.</strong><br><br>
With this php class there is also the possibility (VIEW:ADVANCED CLASS USAGE EXAMPLE N°2 FILE: INDEX_2.PHP)<br>
to load the external fonts all together simultaneously, index_2.php.<br>
To avoid changing this demo into a cyber attack to google servers, and if we want to prevent<br>
google killing me and you; I joke, obviously, I joke ... ;), in the example N°2, I have entered the possibility,<br>
for the external font files, to be stored locally setting a param option: true for locally stored and false for not.<br>
Since, usually, we don't change fonts every day, why we have to connect each time to this external resources ?<br>
Is it necessary .... ? My thought is no, it is not necessary, instead, it need to set the .htaccess file with<br>
a long time cache for the font files.<br>
In the EXAMPLE TWO I have loaded seven different font simultaneously from only one server,<br>
seven are too much, but I did it only for testing to show<br>
that also in this case, with seven different fonts, all text remains visible with<br>
the set up of the font-display during web fonts load.<br>
Simultaneously, when the param option is set to true,<br>
became only the check of the server to the external font resource, and the resources are downloaded only<br>
if locally don't exists.<br><br>
To avoid the <a href="https://developers.google.com/web/tools/lighthouse/audits/critical-request-chains">critical request chain</a><br>
I have set up to defer (load asynchronously) the style with a small escamotage:<br>
style media="none" onload="if(media!='all')media='all'"<br><br>
Here you can see the ligthhouse reports, about performances, of these three demos,<br>example N°1 with two fonts not loaded simultaneously,<br>
example N°2 with seven different fonts loaded and stored locally and<br>example N°3 with seven different fonts loaded simultaneously but not stored locally.<br>
These tests are only indicative and to make a correct comparison<br> the quantities should be homogeneous, ie load the same number of fonts.<br>
In any case, from the various others tests carried out, the fastest is, in any case, the example N°2.<br><br>
example N°1 Emulated Nexus 5X, Throttled Fast 3G network,<br> Network throttling: 562,5 ms HTTP RTT, 1.474,6 Kbps down, 675 Kbps up (DevTools)<br>
CPU throttling: 4x slowdown (DevTools):<br>
<a href="https://googlechrome.github.io/lighthouse/viewer/?gist=b316fc892210f82dfcf56f5285c75ee6">lighthouse performance report N 1</a><br>
example N°1 Emulated Nexus 5X, Throttled Fast 3G network,<br> Network throttling: 150 ms TCP RTT, 1.638,4 Kbps throughput (Simulated)<br>
CPU throttling: 4x slowdown (Simulated):<br>
<a href="https://googlechrome.github.io/lighthouse/viewer/?gist=e79ffd09199fecaa5ecd35f84f3d32e8">lighthouse performance report N 1</a><br><br>
example N°2 Emulated Nexus 5X, Throttled Fast 3G network,<br> Network throttling: 562,5 ms HTTP RTT, 1.474,6 Kbps down, 675 Kbps up (DevTools)<br>
CPU throttling: 4x slowdown (DevTools):<br>
<a href="https://googlechrome.github.io/lighthouse/viewer/?gist=23b8f92d04eb3f32f6cfd7e317535510">lighthouse performance report N 2</a><br>
example N°2 Emulated Nexus 5X, Throttled Fast 3G network,<br> Network throttling: 150 ms TCP RTT, 1.638,4 Kbps throughput (Simulated)<br>
CPU throttling: 4x slowdown (Simulated):<br>
<a href="https://googlechrome.github.io/lighthouse/viewer/?gist=b01c2975e469b0a2d36ea2224a78a84f">lighthouse performance report N 2</a><br><br>
example N°3 Emulated Nexus 5X, Throttled Fast 3G network,<br> Network throttling: 562,5 ms HTTP RTT, 1.474,6 Kbps down, 675 Kbps up (DevTools)<br>
CPU throttling: 4x slowdown (DevTools):<br>
<a href="https://googlechrome.github.io/lighthouse/viewer/?gist=44ee33c578e928a59d04f13a60f18675">lighthouse performance report N 3</a><br>
example N°3 Emulated Nexus 5X, Throttled Fast 3G network,<br> Network throttling: 150 ms TCP RTT, 1.638,4 Kbps throughput (Simulated)<br>
CPU throttling: 4x slowdown (Simulated):<br>
<a href="https://googlechrome.github.io/lighthouse/viewer/?gist=7d88e7348587aa49bc582e0e78375520">lighthouse performance report N 3</a><br><br>
<strong>SIMPLE CLASS USAGE EXAMPLE N°1 FILE:INDEX.PHP (FONT-DISPLAY YES, NO SIMULTANEOUSLY CHECK,<br>
NO FONT FILES ARE STORED LOCALLY, .HTACCESS CACHE YES);</strong><br>
$ref= new Fontperformance;<br>
$font_1 = $ref->fontdisplay("link_to_font_api","fallback");<br>
$font_2 = $ref->fontdisplay("link_to_font_api","auto");<br>
Where param 1 is a string, is the link to external font resource, in this example through google font api.<br>
param 2 is a string, is the performance controlling option. Possible values are:<br>
auto | block | swap | fallback | optional<br><br>
<strong>ADVANCED CLASS USAGE EXAMPLE N°2 FILE:INDEX_2.PHP (FONT-DISPLAY YES, SIMULTANEOUSLY CHECK YES,<br>
ALL FONT FILES ARE STORED LOCALLY IF LOCALLY DO NOT EXIST, .HTACCESS CACHE YES);</strong><br>
$ref= new Fontperformance;<br>
$apilink = array("link_to_font_api_1","link_to_font_api_n", ....);<br>
$ref->multi_simul_fontdisplay($apilink,"fallback",<strong>true</strong>);<br>
where the params1 is an array with all links to the font api,<br> it's good, also, for only one font,<br>
and where the param 2 is a string, is the performance controlling option. Possible values are:<br>
auto | block | swap | fallback | optional <br>,
param 3: true o false, true for storing locally the exernal fonts, false for not storing, (default value is false),
<br> this will return an array with all fonts.<br>
<br>
For a complete reference guide about font-display descriptors please consult:<br>
<a href="https://developers.google.com/web/updates/2016/02/font-display">Controlling Font Performance with font-display
</a><br>
<a href="https://www.w3.org/TR/css-fonts-4/#font-display-font-feature-values">W3C font display</a><br><br>
<a href="https://api.whatsapp.com/send?phone=393315954155">info & contacts</a>
</p>
<p class="tangerine">Yours sincerely<br>Riccardo Castagna</p>
</body>
</html>
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