Google AMP amp-font

Опубликовано: 12 Апреля, 2022

Amp-font используется для проверки того, загружен ли шрифт на HTML- страницу AMP.

Required Scripts: Import amp-font into the header.

HTML

<script async custom-element="amp-font"
    src="https://cdn.ampproject.org/v0/amp-font-0.1.js">
</script>

Мы используем следующий стиль, чтобы отображать шрифт красным цветом, если шрифт недоступен.

HTML

<style amp-custom>
    :root {
        --color-error: #B00020;
        --color-primary: #005AF0;
    }
  
    @font-face {
        font-family: "UnavailableFont";
        font-style: normal;
        font-weight: 400;
        src: url(fonts/UnavailableFont.ttf) format("truetype");
    }
  
    @font-face {
        font-family: "Comic AMP";
        font-style: normal;
        font-weight: 400;
        src: local("Comic AMP"),
            url(/static/samples/fonts/ComicAMP.ttf) 
            format("truetype");
    }
  
    @font-face {
        font-family: "Comic AMP 2";
        font-style: normal;
        font-weight: 400;
        src: local("Comic AMP"), 
            url(/static/samples/fonts/ComicAMP2.ttf) 
            format("truetype");
    }
  
    .unavailable-font-loaded .unavailable-font {
        font-family: "UnavailableFont";
    }
  
    .comicamp-loaded .comicamp {
        font-family: "Comic AMP";
    }
  
    .comicamp2-loaded .comicamp2 {
        font-family: "Comic AMP 2";
    }
  
    .comicamp-loading .comicamp,
    .comicamp2-loading .comicamp2,
    .unavailable-font-loading .unavailable-font {
        color: var(--color-primary);
    }
  
    .comicamp-missing .comicamp,
    .comicamp2-missing .comicamp2,
    .unavailable-font-missing .unavailable-font {
        color: var(--color-error);
    }
</style>

Атрибуты:

  1. font-family: определяет шрифт примера семейства: futura, georgia и т. д.
  2. layout: определяет конкретный макет, этот атрибут должен иметь значение nodisplay.

Example: Here, the second font family is set as abc since there is not family by the name abc it is displayed in red color.

HTML

<!doctype html>
<html amp>
  
<head>
    <meta charset="utf-8">
    <title>Google AMP amp-font</title>
  
    <script async src=
        "https://cdn.ampproject.org/v0.js">
    </script>
      
    <script async custom-element="amp-font" 
src="https://cdn.ampproject.org/v0/amp-font-0.1.js">
    </script>
      
    <link rel="canonical" href=
"https://amp.dev/documentation/examples/components/amp-font/index.html">
      
    <meta name="viewport" content=
"width=device-width,minimum-scale=1,initial-scale=1">
      
    <style amp-boilerplate>
        body {
            -webkit-animation: -amp-start 8s 
                steps(1, end) 0s 1 normal both;
  
            -moz-animation: -amp-start 8s 
                steps(1, end) 0s 1 normal both;
  
            -ms-animation: -amp-start 8s 
                steps(1, end) 0s 1 normal both;
  
            animation: -amp-start 8s 
                steps(1, end) 0s 1 normal both;
        }
  
        @-webkit-keyframes -amp-start {
            from {
                visibility: hidden
            }
  
            to {
                visibility: visible
            }
        }
  
        @-moz-keyframes -amp-start {
            from {
                visibility: hidden
            }
  
            to {
                visibility: visible
            }
        }
  
        @-ms-keyframes -amp-start {
            from {
                visibility: hidden
            }
  
            to {
                visibility: visible
            }
        }
  
        @-o-keyframes -amp-start {
            from {
                visibility: hidden
            }
  
            to {
                visibility: visible
            }
        }
  
        @keyframes -amp-start {
            from {
                visibility: hidden
            }
  
            to {
                visibility: visible
            }
        }
    </style>
  
    <noscript>
        <style amp-boilerplate>
            body {
                -webkit-animation: none;
                -moz-animation: none;
                -ms-animation: none;
                animation: none
            }
        </style>
    </noscript>
      
    <style amp-custom>
        :root {
            --color-error: #B00020;
            --color-primary: #005AF0;
        }
  
        @font-face {
            font-family: "UnavailableFont";
            font-style: normal;
            font-weight: 400;
            src: url(fonts/UnavailableFont.ttf) 
                    format("truetype");
        }
  
        @font-face {
            font-family: "Comic AMP";
            font-style: normal;
            font-weight: 400;
            src: local("Comic AMP"), 
                url(/static/samples/fonts/ComicAMP.ttf) 
                format("truetype");
        }
  
        @font-face {
            font-family: "Comic AMP 2";
            font-style: normal;
            font-weight: 400;
            src: local("Comic AMP"), 
                url(/static/samples/fonts/ComicAMP2.ttf)
                format("truetype");
        }
  
        .unavailable-font-loaded .unavailable-font {
            font-family: "UnavailableFont";
        }
  
        .comicamp-loaded .comicamp {
            font-family: "Comic AMP";
        }
  
        .comicamp2-loaded .comicamp2 {
            font-family: "Comic AMP 2";
        }
  
        .comicamp-loading .comicamp,
        .comicamp2-loading .comicamp2,
        .unavailable-font-loading .unavailable-font {
            color: var(--color-primary);
        }
  
        .comicamp-missing .comicamp,
        .comicamp2-missing .comicamp2,
        .unavailable-font-missing .unavailable-font {
            color: var(--color-error);
        }
    </style>
</head>
  
<body>
    <!-- ## Existing font -->
  
    <div>
        <amp-font layout="nodisplay" 
            font-family="georgia" timeout="2000" 
            on-error-remove-class="comicamp-loading"
            on-error-add-class="comicamp-missing" 
            on-load-remove-class="comicamp-loading"
            on-load-add-class="comicamp-loaded">
        </amp-font>
  
        <p class="comicamp">
            geeks for geeks
        </p>
  
    </div>
  
    <!-- ## Unavailable font  -->
    <div>
        <amp-font layout="nodisplay" font-family="abc" 
            timeout="2000" on-error-remove-class=
            "unavailable-font-loading"
            on-error-add-class="unavailable-font-missing" 
            on-load-remove-class="unavailable-font-loading"
            on-load-add-class="unavailable-font-loaded">
        </amp-font>
          
        <p class="unavailable-font">
            geeks for geeks
        </p>
  
    </div>
</body>
  
</html>

Выход:

РЕКОМЕНДУЕМЫЕ СТАТЬИ