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Gmail
webmail 
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Outlook.com
Webmail
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Android 7.x
Gmail App
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Android 5.x
Mail App
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Apple Mail
macOS 10.14
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Outlook
2013/16/19
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iOS 14
Mail App
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Yahoo! Mail
Webmail
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Thunderbird
67
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CSS Background Properties # |
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background-color
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background-image
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background-position
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background-repeat
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background-size
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CSS Box and Border Properties # |
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border
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border-image
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border-radius
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box-shadow
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height
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width
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max-width
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min-width
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CSS Media Queries # |
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@media
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CSS Text Properties # |
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@font-face
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direction
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font
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font-family
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font-style
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font-variant
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font-size
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font-weight
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letter-spacing
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line-height
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text-align
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CSS Table Properties # |
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border-collapse
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border-spacing
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empty-cells
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HTML # |
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<audio>
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<canvas>
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<iframe>
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<img srcset>
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<picture>
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<video>
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Link Element # |
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<link> in <head>
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<link> in <body>
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Style Element # |
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<style> in <head>
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<style> in <body>
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