upstream-mattermost/server/templates/partials/message_attachment.html

{{if .MessageAttachments}}
<div class="messageAttachments">
    {{range .MessageAttachments}}
    <div class="messageAttachment" style="vertical-align:top;" width="100%">
        <div class="pretext" style="font-family: sans-serif; text-align: left; font-size: 14px; line-height: 20px; color: #3F4350; padding: 0px;">
            {{.Pretext}}
        </div>
        <div class="messageAttachmentContent" style="border-left: 4px solid {{.Color}}; padding: 12px;">
            <table border="0" cellpadding="0" cellspacing="0" role="presentation" style="vertical-align:top; font-size: 14px" width="100%">
                <tbody>
                {{if or .AuthorIcon .AuthorName}}
                <tr>
                    <td>
                        {{if .AuthorLink}}<a href="{{.AuthorLink}}">{{end}}
                        {{if .AuthorIcon}}<img class="attachment__author-icon" alt="attachment author icon" src="{{.AuthorIcon}}"/>{{end}}
                        {{if .AuthorName}}<span class="attachment__author-name">{{.AuthorName}}</span>{{end}}
                        {{if .AuthorLink}}</a>{{end}}
                    </td>
                </tr>
                {{end}}
                {{if .Title}}
                <tr>
                    <td>
                        <h1 class="attachment__title">
                            {{if .TitleLink}}<a href="{{.TitleLink}}">{{end}}
                            {{.Title}}
                            {{if .Title}}</a>{{end}}
                        </h1>
                    </td>
                </tr>
                {{end}}
                </tbody>
            </table>

            <div class="attachment__wrapper">
                <div class="attachment__body">
                    <table border="0" cellpadding="0" cellspacing="0" role="presentation" style="vertical-align:top; font-size: 14px; color: #3F4350;" width="100%">
                        <tbody>
                        <tr>
                            <td vertical-align="middle" class="messageButton">
                                <div>{{.Text}}</div>
                            </td>
                        </tr>
                        {{if .ImageURL}}
                        <tr>
                            <td>
                                <img class="attachment__image" src="{{.ImageURL}}"/>
                            </td>
                        </tr>
                        {{end}}
                    </table>

                    <table border="0" cellpadding="0" cellspacing="0" role="presentation" style="vertical-align:top; font-size: 14px; table-layout: fixed; margin-bottom: 0.7em;" width="100%">
                        {{range .FieldRows}}
                        <tr class="messageAttachment_row">
                            {{ $length := len .Cells }}
                            {{range .Cells}}
                            <td
                                    class="messageAttachment_field"
                                    {{ if eq $length 1 }}colspan="2"{{end}}
                            >
                                <div class="messageAttachment_title">{{.Title}}</div>
                                <div>{{.Value}}</div>
                            </td>
                            {{end}}
                        </tr>
                        {{end}}
                    </table>
                </div>

                {{if .ThumbURL}}
                <div class="attachment__thumb-container">
                    <img class="attachment__thumb-image" src="{{.ThumbURL}}"/>
                </div>
                {{end}}
            </div>

            {{if .Footer}}
            <table class="attachment__footer-container" border="0" cellpadding="0" cellspacing="0" role="presentation" style="vertical-align:top; font-size: 14px" width="100%">
                <tbody>
                <tr>
                    <td>
                        {{if .FooterIcon}}<img class="attachment__footer-icon" src="{{.FooterIcon}}" style="vertical-align: middle;"/>{{end}}
                        <span style="font-size: 12px;">{{.Footer}}</span>
                    </td>
                </tr>
                </tbody>
            </table>
            {{end}}

        </div>
    </div>
    {{end}}
</div>
{{end}}