Base64 encoding impact on ascii3/20/2023 Length limitationsīrowsers are not required to support any particular maximum length of data. As a URL, the data should be formattable with whitespace (linefeed, tab, or spaces), but there are practical issues that arise when using base64 encoding. Formatting in HTMLĪ data URL provides a file within a file, which can potentially be very wide relative to the width of the enclosing document. The format for data URLs is very simple, but it's easy to forget to put a comma before the "data" segment, or to incorrectly encode the data into base64 format. Note that the closing script tag is required. data:text/plain base64,SGVsbG8sIFdvcmxkIQ=īase64-encoded version of the above data:text/html,%3Ch1%3EHello%2C%20World%21%3C%2Fh1%3EĪn HTML document with Hello, World! data:text/html,%3Cscript%3Ealert%28%27hi%27%29%3B%3C%2Fscript%3EĪn HTML document with alert('hi') that executes a JavaScript alert. Note how the comma is URl encoded as %2C, and the space character as %20. You can find more info on MIME types here and here.Ī few examples: data:,Hello%2C%20World%21 Otherwise, you can specify base64 to embed base64-encoded binary data. If the data is textual, you can embed the text (using the appropriate entities or escapes based on the enclosing document's type). If the data contains characters defined in RFC 3986 as reserved characters, or contains space characters, newline characters, or other non-printing characters, those characters must be URL encoded ( aka "URL encoded"). If omitted, defaults to text/plain charset=US-ASCII The mediatype is a MIME type string, such as 'image/jpeg' for a JPEG image file. Permissions-Policy: xr-spatial-tracking Experimental. Permissions-Policy: speaker-selection Experimental.Permissions-Policy: serial Experimental.Permissions-Policy: screen-wake-lock Experimental.Permissions-Policy: publickey-credentials-get Experimental.Permissions-Policy: picture-in-picture Experimental.Permissions-Policy: payment Experimental.Permissions-Policy: magnetometer Experimental.Permissions-Policy: local-fonts Experimental.Permissions-Policy: idle-detection Experimental.Permissions-Policy: gyroscope Experimental.Permissions-Policy: gamepad Experimental.
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