ego confused by 'bulletproof button'

[kmanley]

It's a common pattern in email templates to use 'bulletproof buttons'
https://www.litmus.com/blog/a-guide-to-bulletproof-buttons-in-email-design/

but this confuses ego, e.g. this snippet of HTML in an ego template

<table class="body-action" align="center" width="100%" cellpadding="0" cellspacing="0">
                        <tr>
                        <td align="center">
                            <div>
                            <!--[if mso]><v:roundrect xmlns:v="urn:schemas-microsoft-com:vml" xmlns:w="urn:schemas-microsoft-com:office:word" href="<%=gifturl%>" style="height:45px;v-text-anchor:middle;width:200px;" arcsize="7%" stroke="f" fill="t">
                            <v:fill type="tile" color="#0072ce" />
                            <w:anchorlock/>
                            <center style="color:#ffffff;font-family:sans-serif;font-size:15px;">Get my gift!</center>
                            </v:roundrect><![endif]-->
                            <a href="<%=gifturl%>" class="button button--blue">Get my gift</a>
                            </div>
                        </td>
                        </tr>
                    </table>

causes ego to emit

//line email_gift_fulfilled_html.ego:33
	_, _ = io.WriteString(w, html.EscapeString(fmt.Sprint(lib.FormatMoney(enrollment.Plan.GiftValue, 0, 2, false, true))))
//line email_gift_fulfilled_html.ego:33
	_, _ = io.WriteString(w, " gift. It's now ready and \n                    you can pick it up here:\n                    </p>\n                    <table class=\"body-action\" align=\"center\" width=\"100%\" cellpadding=\"0\" cellspacing=\"0\">\n                        <tr>\n                        <td align=\"center\">\n                            <div>\n                            <!--[if mso]>")
//line email_gift_fulfilled_html.ego:40
	{
		var EGO v.roundrect
		EGO.Attrs = map[string]string{
			"xmlns:v": fmt.Sprint("urn:schemas-microsoft-com:vml"),
			"xmlns:w": fmt.Sprint("urn:schemas-microsoft-com:office:word"),
			"href":    fmt.Sprint("<%=gifturl%>"),
			"style":   fmt.Sprint("height:45px;v-text-anchor:middle;width:200px;"),
			"arcsize": fmt.Sprint("7%"),
			"stroke":  fmt.Sprint("f"),
			"fill":    fmt.Sprint("t"),
		}
		EGO.Yield = func() {
//line email_gift_fulfilled_html.ego:41
			_, _ = i

which causes a subsequent compilation error

undefined: v in v.roundrect
undefined: v in v.fill
...etc...

[benbjohnson]

@kmanley Thanks for the bug report. Ego uses namespaces for Go packages but I forgot that some HTML (like bulletproof buttons) uses them. Let me think about how to fix it. Maybe we can ignore the namespace if xmlns is defined on an element.