Google AMP amp-font

Last Updated : 25 Oct, 2020

The amp-font is used to check if the font is loaded or not in an AMP HTML page.

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>

We use the following styling to display the font in red if the font is not available.

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>

Attributes :

font-family: Specifies the font of the family example : futura, georgia etc.
layout: Defines a specific layout this attribute must be set to 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>