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Text of the page (random words):
escape e preventdefault closemenu button focus break keep open while hovering submenu close when leaving submenu addeventlistener mouseenter cancelclose cancelpendingopen new catch pointer transitions anywhere inside the submenu including before fence submenu addeventlistener pointerover cancelclose cancelpendingopen true close on mouse leaving the nav but keep current behavior for touch pen nav addeventlistener pointerleave e if we just closed search ignore this leave pulse if justclosedsearch return new if we re leaving nav before the delayed open triggers cancel it cancelpendingopen const to e relatedtarget if to nav contains to submenu contains to return if e pointertype mouse const ae document activeelement const focusinside ae nav contains ae submenu contains ae if focusinside return scheduleclose reason mouse leave nav addeventlistener mouseenter cancelclose keep underline behavior nav hovered js driven class so the nav background turns blue on hover but uses the same debounce as the close logic preventing the flicker that raw css hover caused during the 400ms open delay window function removenavhovered settimeout const navel document queryselector nav desktop navigation const submenuel document getelementbyid mainsubmenu if navel matches hover submenuel matches hover navel classlist remove nav hovered 300 nav addeventlistener mouseenter nav classlist add nav hovered nav addeventlistener mouseleave removenavhovered submenu addeventlistener mouseleave removenavhovered focus guards to prevent flicker on tab navigation nav addeventlistener focusin any time focus enters anything inside the nav submenu cancel pending closes cancelclose cancelpendingopen new don t let delayed hover open race with keyboard focus give ourselves a brief grace window so a late close timer can t win the race focusguarduntil performance now date now 600 300ms is plenty nav addeventlistener focusout defer one tick to let the new activeelement settle settimeout const ae document activeelement const stillinside nav contains ae submenu contains ae if stillinside scheduleclose 0 desktop search const menumainitems document queryselector menu main items const searchicon document getelementbyid search icon const searchform document getelementbyid search formz const searchinput document getelementbyid search field const searchclose document getelementbyid search close function opensearchbar close any submenu kill pending close timers closemenu cancelclose cancelpendingopen new menumainitems classlist add hidden settimeout if searchicon searchform return searchicon style display none searchform classlist add active setsearchformfocusable true searchinput focus 150 function closesearchbarsafely make main menu visible again menumainitems classlist remove hidden if searchicon searchicon style display inline block collapse the form searchform classlist remove active setsearchformfocusable false if searchinput searchinput value kill any queued closes set short no close window cancelclose cancelpendingopen new const now performance now date now hoverlockuntil now 600 extra cushion so a late timer can t win focusguarduntil now 800 and protect focus transitions justclosedsearch true settimeout justclosedsearch false 900 return focus to the icon searchicon document getelementbyid search icon focus if searchicon searchform searchinput searchclose open on search icon click searchicon addeventlistener click opensearchbar close safely on the x button searchclose addeventlistener click closesearchbarsafely also allow esc to close safely while the field has focus searchform addeventlistener keydown e if e key escape e preventdefault closesearchbarsafely submit handlers unchanged searchform addeventlistener submit e e preventdefault const q encodeuricomponent searchinput value trim if q window location href https www burnsmcd com search q q guard your existing scheduleclose against the immediate post search window if typeof scheduleclose function const _origscheduleclose scheduleclose scheduleclose function if justclosedsearch return ignore closes right after search collapses return _origscheduleclose apply this arguments nav addeventlistener keydown e if e key escape closemenu function closemenu cancelpendingopen new if something triggers close while delayed open is queued setsubmenufocusable false const submenu document getelementbyid mainsubmenu focusguarduntil 0 if submenu return add closing so content fades quickly via css but we animate height to 0 submenu classlist add closing freeze current height and animate it down const currentheight submenu offsetheight submenu style height currentheight px submenu offsetheight reflow submenu style transition height 0 4s cubic bezier 22 61 36 1 opacity 150ms ease transform 4s ease submenu style height 0px sync overlay fade with submenu retract we want the overlay fade 180ms to end when height transition ends so we start fading it after heightdur overlaydur const cs getcomputedstyle submenu const heightdurms const raw cs transitionduration 0s split 0 trim return raw endswith ms parsefloat raw parsefloat raw 0 1000 400 const overlaydurms 180 matches desktop overlay css const startoverlayfadeafter math max 0 math round heightdurms overlaydurms don t hide immediately fade it in sync with the submenu cleartimeout submenu _overlaysyncto submenu _overlaysyncto settimeout hidedesktopoverlay this triggers the overlay s css opacity transition startoverlayfadeafter let cleaned false const cleanup if cleaned return cleaned true submenu style transition submenu style height 0 submenu classlist remove active closing submenu removeeventlistener transitionend onend document queryselector nav desktop navigation removeattribute data open const onend e if e e propertyname height cleanup submenu addeventlistener transitionend onend fallback in case transitionend doesn t fire background tab etc cleartimeout submenu _closefallbackto submenu _closefallbackto settimeout cleanup math max 250 heightdurms 200 reset top level button states document queryselectorall menuitem button foreach b b classlist remove active b setattribute aria expanded false if typeof activemenuitem undefined activemenuitem null document addeventlistener focusin e const nav document queryselector nav desktop navigation const submenu document getelementbyid mainsubmenu if nav submenu return if nav contains e target submenu contains e target return only schedule the close overlay fade will be synced inside closemenu scheduleclose close intentionally on focus of these targets search icon logo a foreach sel const el document queryselector sel el addeventlistener focus if typeof closemenu function closemenu const contact document queryselector contact us a contact us button const firsttop document queryselector menu main items menuitem button navigationmedium contact addeventlistener keydown e if e key tab e shiftkey e preventdefault kill any pending close timers before we move focus if typeof cancelclose function cancelclose cancelpendingopen new focus the first top level item and open its submenu immediately firsttop focus if typeof opensubmenufrom function firsttop opensubmenufrom firsttop unified close scheduler mouse leave can bypass the focus inside guard function scheduleclose opts const reason opts reason other ️ ignore any close attempts right after search was collapsed if justclosedsearch return cancelclose closetimeout settimeout const now performance now date now const navel document queryselector nav desktop navigation const submenuel document getelementbyid mainsubmenu still in the no close window from search bail if justclosedsearch return if keyboard focus is inside only allow close when it was a true mouse leave const ae document activeelement const focusinside ae navel contains ae submenuel contains ae if reason mouse leave focusinside return grace windows to avoid flicker around opening focus if now button navigationmedium find btn btn classlist contains contact btn idempotent no touching styles if abort flag is set const done if submenu dataset primingabort 1 return real open already started submenu removeattribute data priming submenu setattribute data primed true submenu style transition let css take back over submenu offsetheight force it to take if firstbtn done return const doprime if submenu dataset primingabort 1 return bail if user hovered firstbtn dispatchevent new event mouseover bubbles true submenu classlist add active void submenu offsetheight submenu classlist remove active submenu style height 0px requestanimationframe if submenu dataset primingabort 1 return bail again if needed submenu style removeproperty height done requestanimationframe requestanimationframe doprime keyboard bridge left column right sublinks and back document addeventlistener domcontentloaded const submenu document getelementbyid mainsubmenu const linkcolumn submenu queryselector link column const addpanel submenu queryselector links panel if submenu linkcolumn addpanel return function getactiveleft const active linkcolumn queryselector navmedium active document activeelement closest navmedium if active return active null subs const title active getattribute data title active textcontent trim const data window currentnavdata find i i title title const has data array isarray data addlinks data addlinks length return active has title subs array from addpanel queryselectorall a subsubnav link linkcolumn addeventlistener keydown e if e key tab e shiftkey return const a e target closest a navmedium if a return const title a getattribute data title a textcontent trim ensure right panel shows current left item window showaddlinks title const rightpanelisactive addpanel classlist contains active const firstvisible array from addpanel queryselectorall a subsubnav link find el el offsetparent null if rightpanelisactive firstvisible e preventdefault firstvisible focus addpanel addeventlistener keydown e if e key tab return const visiblesubs array from addpanel queryselectorall a subsubnav link filter el el offsetparent null if visiblesubs length return const first visiblesubs 0 const last visiblesubs visiblesubs length 1 const active getactiveleft if e shiftkey e target first e preventdefault active focus return if e shiftkey e target last e preventdefault const leftitems array from linkcolumn queryselectorall a navmedium const idx leftitems indexof linkcolumn queryselector navmedium active document activeelement closest navmediuml const next leftitems idx 1 next next focus last blur submenu top button tab cycling document addeventlistener domcontentloaded const submenu document getelementbyid mainsubmenu const menublock document queryselector menu main items if submenu menublock return const topbuttons array from menublock queryselectorall menuitem button navigationmedium const isvisible el el el offsetparent null getcomputedstyle el visibility hidden const tabbablesinsubmenu array from submenu queryselectorall a href button not disabled tabindex 0 filter isvisible const currenttopbutton topbuttons find b b getattribute aria expanded true document activeelement closest menuitem queryselector button navigationmedium null const focusnexttop const cur currenttopbutton const idx topbuttons indexof cur const next topbuttons idx 1 if next next focus open next submenu as before else leaving the top menu rail go to search or contact and close the submenu const searchbtn document getelementbyid search icon const contactbtn document queryselector contact us a contact us button closemenu searchbtn contactbtn topbuttons 0 focus const focusprevtop const cur currenttopbutton const idx topbuttons indexof cur const prev topbuttons idx 1 if prev prev focus else closemenu document queryselector logo a focus submenu addeventlistener keydown e if e key tab return const t tabbablesinsubmenu if t length return const first t 0 const last t t length 1 if e shiftkey e target last e preventdefault bumpfocusguard focusnexttop else if e shiftkey e target first e preventdefault bumpfocusguard focusprevtop what we do insights news careers about contact us menu explore our family of brands stay in touch with the things that matter most subscribe main sections what we do insights news careers about contact us burns mcdonnell engineering construction architecture and consulting shaping the future of energy showcasing our perspective q2 construction market update explore the latest using bess to enhance capacity and reliability watch the video fit for purpose matching the tool to the task read the blog shaping the future of energy q2 construction market update using bess to enhance capacity and reliability fit for purpose matching the tool to the task what drives us solving the world s toughest challenges our engineers construction and craft professionals architects planners technologists and scientists do more than plan design and construct with a mission unchanged since 1898 make our clients successful our fully integrated teams are dedicated to building a world that s ready for anything explore what we do 100 employee owned 75 offices worldwide top 5 of u s aec firms for safety safeguarding what matters most explore our safety commitment featured projects view all aviation replacement passenger terminal commercial retail institutional kc streetcar riverfront pavilion progressive design build power southwest substation manufacturing industrial demonstration scale bioindustrial manufacturing plant aviation replacement passenger terminal commercial retail institutional kc streetcar riverfront pavilion progressive design build power southwest substation manufacturing industrial demonstration scale bioindustrial manufacturing plant at burns mcdonnell we are intentional prioritizing our initiatives throughout the organization adopting technology systems and processes to align and fortify our future and most importantly continuing to go above and beyond for our clients leslie m duke chair and ceo insights view all white paper the refining knowledge gap why operational intelligence matters now 1898 co white paper 5g redcap and eredcap an evolution in utility connectivity article keep food and beverage manufacturing lines running during retrofits news view all burns mcdonnell celebrates growth job creation and expanded office space in duluth july 1 2026 city of de soto doubles capacity of wastewater treatment plant to support ev battery manufacturing facility june 24 2026 jeff allen appointed senior vice president americas west at burns mcdonnell june 22 2026 adam matthiesen to lead midwest region at burns mcdonnell june 16 2026 let s connect collaborate with us contact us join our team explore careers making our clients successful contact us accessibility privacy statement ethics compliance manage email preferences linkedin facebook instagram x formerly twitter youtube 2026 burns mcdonnell all rights reserved at this time burns mcdonnell is not 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