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description= Burns & McDonnell is a 100% employee-owned firm founded in 1898 that designs and builds critical infrastructure from more than 75 offices worldwide.;
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Text of the page (random words):
mcontentloaded const desktopoverlay document getelementbyid desktopoverlay const desktopnavbar document queryselector desktop navigation nav container const submenu document getelementbyid mainsubmenu const menuitems document queryselectorall menuitem const nav document queryselector nav desktop navigation const searchicon document getelementbyid search icon const searchform document getelementbyid search formz const searchinput document getelementbyid search field const searchclose document getelementbyid search close const searchmainlane document queryselector menuitem search main if searchmainlane pointer hover can still collapse searchmainlane addeventlistener mouseenter cancelclose only close if focus is entering from outside the nav submenu searchmainlane addeventlistener focusin e const from e relatedtarget if from nav contains from document getelementbyid mainsubmenu contains from return scheduleclose if el hasattribute data prev tabindex const ti el getattribute tabindex if ti null el setattribute data prev tabindex ti else el setattribute data prev tabindex el setattribute tabindex 1 else searchform removeattribute aria hidden searchform removeattribute inert searchform queryselectorall a button input tabindex foreach el const prev el getattribute data prev tabindex if prev null if prev el removeattribute tabindex else el setattribute tabindex prev el removeattribute data prev tabindex else el removeattribute tabindex setsearchformfocusable false function setsubmenufocusable on const el document getelementbyid mainsubmenu if el return if on el removeattribute aria hidden el removeattribute inert el queryselectorall data prev tabindex foreach n const prev n getattribute data prev tabindex if prev n removeattribute tabindex else n setattribute tabindex prev n removeattribute data prev tabindex else el setattribute aria hidden true el setattribute inert el queryselectorall a button input select textarea tabindex foreach n if n hasattribute data prev tabindex const ti n getattribute tabindex n setattribute data prev tabindex ti n setattribute tabindex 1 setsubmenufocusable false function sizedesktopoverlay const h desktopnavbar math round desktopnavbar getboundingclientrect height 100 desktopoverlay style setproperty desktop overlay top h px function showdesktopoverlay sizedesktopoverlay if desktopoverlay return desktopoverlay hidden false desktopoverlay dataset open true function hidedesktopoverlay if desktopoverlay return desktopoverlay dataset open false match the css transition 18s tiny buffer settimeout desktopoverlay hidden true 200 was 250 window addeventlistener resize sizedesktopoverlay desktopoverlay addeventlistener click closemenu sizedesktopoverlay let closetimeout null move your existing one up to here let hoverlockuntil 0 move your existing one up to here let focusguarduntil 0 new brief grace period after focusin let justclosedsearch false new delayed open on hover let opendelayto null let pendingopenbtn null const hover_open_delay_ms 400 function cancelpendingopen if opendelayto cleartimeout opendelayto opendelayto null pendingopenbtn null note setactivemenuitem is used by the delay logic so it must be defined before listeners below let activemenuitem null function setactivemenuitem button menuitems foreach mi mi queryselector button classlist remove active button classlist add active activemenuitem button function opensubmenufromhover button underline immediately setactivemenuitem button but delay the dropdown cancelpendingopen pendingopenbtn button opendelayto settimeout only open if we re still pending on the same button prevents races if pendingopenbtn button return opensubmenufrom button cancelpendingopen hover_open_delay_ms function bumpfocusguard ms 600 focusguarduntil performance now date now ms cancelclose replacement function opensubmenufrom button never start a close while we re opening cancelclose cancelpendingopen new kill delayed opens if we decided to open now focusguarduntil performance now date now 600 const submenu document getelementbyid mainsubmenu if submenu button return if the first open priming is still active abort it so real animations work submenu dataset primingabort 1 submenu removeattribute data priming if a close animation is in progress abort clean it so we can open cleanly if submenu classlist contains closing submenu classlist remove closing if submenu _closefallbackto cleartimeout submenu _closefallbackto submenu _closefallbackto null submenu style transition submenu style height submenu style overflow reflow to apply the reset before we proceed submenu offsetheight mark this top level button as active aria expanded clear others setactivemenuitem button document queryselectorall menuitem button foreach b b setattribute aria expanded b button true false make submenu visible before building content so height measure works submenu classlist add active nav setattribute data open true setsubmenufocusable true populate the submenu your inline onmouseover triggers togglepanel const mouseevt new mouseevent mouseover bubbles true view window if typeof button onmouseover function button onmouseover mouseevt else button dispatchevent mouseevt set a short hover lock so scheduleclose can t immediately win the race hoverlockuntil typeof performance undefined performance now date now 260 safety if nothing rendered expanded this frame try once more next frame requestanimationframe if submenu offsetheight 0 if typeof button onmouseover function button onmouseover mouseevt else button dispatchevent mouseevt submenu classlist add active show the page overlay dim background if typeof showdesktopoverlay function showdesktopoverlay top level menu items hover focus keys menuitems foreach item index const button item queryselector button const iscontact button classlist contains contact btn const issearch item queryselector search icon if button iscontact issearch changed hover gets underline immediately but submenu opens after 200ms item addeventlistener mouseenter opensubmenufromhover button new if you leave the item before the delay cancel the pending open item addeventlistener mouseleave cancelpendingopen keyboard focus should remain immediate no delay button addeventlistener focus opensubmenufrom button button addeventlistener click e e preventdefault opensubmenufrom button submenu queryselector a button focus button addeventlistener keydown e const islast index menuitems length 1 const isfirst index 0 switch e key case arrowright e preventdefault if islast menuitems index 1 queryselector button focus break case arrowleft e preventdefault if isfirst menuitems index 1 queryselector button focus break case arrowdown case enter case e preventdefault opensubmenufrom button submenu queryselector link column a link column button a button focus break case 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 sub...
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