zulip/static/templates/compose_control_buttons.hbs

<div class="compose_left_wrapper order-1">
    <div class="compose_control_buttons_container order-1">
        <input type="file" class="file_input notvisible pull-left" multiple />
        {{#if file_upload_enabled }}
        <a role="button" class="compose_control_button compose_upload_file fa fa-paperclip notdisplayed" aria-label="{{t 'Upload files' }}" tabindex=0 data-tippy-content="{{t 'Upload files' }}"></a>
        {{/if}}
        <a role="button" class="markdown_preview compose_control_button fa fa-eye" aria-label="{{t 'Preview' }}" tabindex=0 data-tippy-content="{{t 'Preview' }}"></a>
        <a role="button" class="undo_markdown_preview compose_control_button fa fa-edit" aria-label="{{t 'Write' }}" tabindex=0 style="display:none;" data-tippy-content="{{t 'Write' }}"></a>
        <a role="button" class="compose_control_button fa fa-video-camera video_link" aria-label="{{t 'Add video call' }}" tabindex=0 data-tippy-content="{{t 'Add video call' }}"></a>
        <a role="button" class="compose_control_button fa fa-smile-o emoji_map" aria-label="{{t 'Add emoji' }}" tabindex=0 data-tippy-content="{{t 'Add emoji' }}"></a>
        <a role="button" class="compose_control_button compose_gif_icon {{#unless giphy_enabled }} hide {{/unless}} zulip-icon zulip-icon-gif" aria-label="{{t 'Add GIF' }}" tabindex=0 data-tippy-content="{{t 'Add GIF' }}"></a>
        <a role="button" class="compose_control_button fa fa-clock-o time_pick" aria-label="{{t 'Add global time' }}" tabindex=0 data-tippy-content="{{t 'Add global time<br />Everyone sees global times in their own time zone.' }}" data-tippy-maxWidth="none" data-tippy-allowHtml="true"></a>
        <div class="divider">|</div>
        <a role="button" data-format-type="bold" class="compose_control_button fa fa-bold formatting_button" aria-label="{{t 'Bold' }}" tabindex=0 data-tippy-content="{{t 'Bold' }}"></a>
        <a role="button" data-format-type="italic" class="compose_control_button fa fa-italic formatting_button" aria-label="{{t 'Italic' }}" tabindex=0 data-tippy-content="{{t 'Italic' }}"></a>
        <a role="button" data-format-type="link" class="compose_control_button fa fa-link formatting_button" aria-label="{{t 'Link' }}" tabindex=0 data-tippy-content="{{t 'Link' }}"></a>
        <div class="divider">|</div>
        <a role="button" class="message-control-link" tabindex=0 data-overlay-trigger="message-formatting">{{t 'Help' }}</a>
    </div>
</div>